flash/nor/sfdp: Fix broken DEBUG log line on macOS

https://review.openocd.org/c/openocd/+/8439 changed variable `words`
from uint8_t to unsigned int in sfdp.c but failed to update the
LOG_DEBUG line to reflect the new type. On macOS this caused:

src/flash/nor/sfdp.c:107:28: error: format specifies type 'unsigned
char' but the argument has type 'unsigned int' [-Werror,-Wformat]

The formatting of the debug line has been updated to reflect the updated
type.

Change-Id: Ifc7ddb1279ab2603901c969d9c09af847f3a3caf
Signed-off-by: Pete Moore <pmoore@mozilla.com>
Reviewed-on: https://review.openocd.org/c/openocd/+/8660
Tested-by: jenkins
Reviewed-by: Tomas Vanek <vanekt@fbl.cz>
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>

src/flash/nor/sfdp.c

@@ -103,7 +103,7 @@ int spi_sfdp(struct flash_bank *bank, struct flash_device *dev,
 		uint16_t id = (((pheaders[k].ptr) >> 16) & 0xFF00) | (pheaders[k].revision & 0xFF);
 		uint32_t ptr = pheaders[k].ptr & 0xFFFFFF;
 
-		LOG_DEBUG("pheader %d len=0x%02" PRIx8 " id=0x%04" PRIx16
+		LOG_DEBUG("pheader %d len=0x%02x id=0x%04" PRIx16
 			" ptr=0x%06" PRIx32, k, words, id, ptr);
 
 		/* retrieve parameter table */