arm: Disable SPL_FS_FAT when it isn't used

Several boards enable SPL_FS_FAT and SPL_LIBDISK_SUPPORT when they can't be
used (as there is no block device support enabled). Disable these configs.
The list of boards was generated with the following command:

    $ tools/qconfig.py -f SPL SPL_FS_FAT ~SPL_MMC ~SPL_BLK_FS ~SPL_SATA \
                          ~SPL_USB_STORAGE ~ENV_IS_IN_FAT ~EFI

LIBDISK was left enabled for the am* boards, since it seems to result in
actual size reduction, indicating that partitions are being used for
something.

Signed-off-by: Sean Anderson <seanga2@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Michal Simek <michal.simek@amd.com>
diff --git a/configs/zynq_cse_nand_defconfig b/configs/zynq_cse_nand_defconfig
index 19f653f..2eb45e1 100644
--- a/configs/zynq_cse_nand_defconfig
+++ b/configs/zynq_cse_nand_defconfig
@@ -13,6 +13,8 @@
 CONFIG_SPL_STACK_R_ADDR=0x200000
 CONFIG_SPL_STACK=0xfffffe00
 CONFIG_SPL=y
+# CONFIG_SPL_FS_FAT is not set
+# CONFIG_SPL_LIBDISK_SUPPORT is not set
 CONFIG_SYS_LOAD_ADDR=0x0
 CONFIG_REMAKE_ELF=y
 CONFIG_SYS_CUSTOM_LDSCRIPT=y