kexec: ppc64: print help to stdout instead of stderr

Currently 'kexec --help' on powerpc64 prints the generic help/usage to
stdout, and the powerpc64 specific options to stderr

That is, if the stdout of 'kexec --help' is redirected to some file,
some of the help options will not be redirected, and instead printed on
the terminal/stderr:

    [root@machine kexec-tools]# kexec --help > /tmp/out
         --command-line=<Command line> command line to append.
         --append=<Command line> same as --command-line.
         --ramdisk=<filename> Initial RAM disk.
         --initrd=<filename> same as --ramdisk.
         --devicetreeblob=<filename> Specify device tree blob file.
                                     Not applicable while using
    --kexec-file-syscall.
         --dtb=<filename> same as --devicetreeblob.
    elf support is still broken
         --elf64-core-headers Prepare core headers in ELF64 format
         --dt-no-old-root Do not reuse old kernel root= param.
                          while creating flatten device tree.

Fix this inconsistency by writing powerpc64 specific options to stdout,
similar to the generic 'kexec --help'

With the proposed changes, it is like this (nothing printed to stderr):

    [root@machine kexec-tools]# ./build/sbin/kexec --help > /tmp/out

Reported-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Signed-off-by: Aditya Gupta <adityag@linux.ibm.com>
Signed-off-by: Simon Horman <horms@kernel.org>

kexec/arch/ppc64/kexec-elf-ppc64.c

@@ -482,15 +482,15 @@ int elf_ppc64_load(int argc, char **argv, const char *buf, off_t len,
 
 void elf_ppc64_usage(void)
 {
-	fprintf(stderr, "     --command-line=<Command line> command line to append.\n");
-	fprintf(stderr, "     --append=<Command line> same as --command-line.\n");
-	fprintf(stderr, "     --ramdisk=<filename> Initial RAM disk.\n");
-	fprintf(stderr, "     --initrd=<filename> same as --ramdisk.\n");
-	fprintf(stderr, "     --devicetreeblob=<filename> Specify device tree blob file.\n");
-	fprintf(stderr, "                                 ");
-	fprintf(stderr, "Not applicable while using --kexec-file-syscall.\n");
-	fprintf(stderr, "     --reuse-cmdline Use kernel command line from running system.\n");
-	fprintf(stderr, "     --dtb=<filename> same as --devicetreeblob.\n");
-
-	fprintf(stderr, "elf support is still broken\n");
+	printf("     --command-line=<Command line> command line to append.\n");
+	printf("     --append=<Command line> same as --command-line.\n");
+	printf("     --ramdisk=<filename> Initial RAM disk.\n");
+	printf("     --initrd=<filename> same as --ramdisk.\n");
+	printf("     --devicetreeblob=<filename> Specify device tree blob file.\n");
+	printf("                                 ");
+	printf("Not applicable while using --kexec-file-syscall.\n");
+	printf("     --reuse-cmdline Use kernel command line from running system.\n");
+	printf("     --dtb=<filename> same as --devicetreeblob.\n");
+
+	printf("elf support is still broken\n");
 }

kexec/arch/ppc64/kexec-ppc64.c

@@ -910,9 +910,9 @@ int file_types = sizeof(file_type) / sizeof(file_type[0]);
 
 void arch_usage(void)
 {
-	fprintf(stderr, "     --elf64-core-headers Prepare core headers in ELF64 format\n");
-	fprintf(stderr, "     --dt-no-old-root Do not reuse old kernel root= param.\n" \
-	                "                      while creating flatten device tree.\n");
+	printf("     --elf64-core-headers Prepare core headers in ELF64 format\n");
+	printf("     --dt-no-old-root Do not reuse old kernel root= param.\n"
+	       "                      while creating flatten device tree.\n");
 }
 
 struct arch_options_t arch_options = {

kexec/arch/ppc64/kexec-zImage-ppc64.c

@@ -180,5 +180,5 @@ int zImage_ppc64_load(FILE *file, int UNUSED(argc), char **UNUSED(argv),
 
 void zImage_ppc64_usage(void)
 {
-	fprintf(stderr, "zImage support is still broken\n");
+	printf("zImage support is still broken\n");
 }