spl: sata: don't force FS_FAT support

Allow the code to build when FS_FAT is not enabled, and thus
spl_load_image_fat() is not provided.

A subsequent patch should add alternative raw access U-Boot main image
load method.

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Stefan Roese <sr@denx.de>
1 file changed