README: update qspi image directories

During the Yocto reorg, QSPI configs were updated which now means that
the images are deployed in different directories than before. Update
instructions to reflect this name change.

Signed-off-by: Jamie Gibbons <jamie.gibbons@microchip.com>

README.md

@@ -182,13 +182,13 @@ Once sure of the drive identifier, use the following command to copy your Linux
 For flashing a Linux image suitable for a **Winbond W25N01GV NAND** flash memory:
 
 ```bash
-$ sudo dd if=tmp-glibc/deploy/images/icicle-kit-es/core-image-minimal-mtdutils-icicle-kit-es-nand.nand.mtdimg of=/dev/sdX
+$ sudo dd if=tmp-glibc/deploy/images/icicle-kit-es-nand/core-image-minimal-mtdutils-icicle-kit-es-nand.nand.mtdimg of=/dev/sdX
 ```
 
 For flashing a Linux image suitable for a **Micron MT25QL256 NOR** flash memory:
 
 ```bash
-$ sudo dd if=tmp-glibc/deploy/images/icicle-kit-es/core-image-minimal-mtdutils-icicle-kit-es-nor.nor.mtdimg of=/dev/sdX
+$ sudo dd if=tmp-glibc/deploy/images/icicle-kit-es-nor/core-image-minimal-mtdutils-icicle-kit-es-nor.nor.mtdimg of=/dev/sdX
 ```
 
 When the transfer has completed, press CTRL+C in the HSS serial console to return to the HSS console.