uboot-imx

ARM: at91: spl: Add macro CONFIG_XXXX_BOOT support

Use the CONFIG_XXXX_BOOT to indicate the boot media, instead of
the CONFIG_SYS_USE_XXXX option, which is declared by
CONFIG_SYS_EXTRA_OPTIONS option.

Signed-off-by: Wenyou Yang <wenyou.yang@microchip.com>