spl: Kconfig: SPL_MMC_SUPPORT depends on GENERIC_MMC

spl_mmc.c calls mmc_initialize(). This symbol is provided in
drivers/mmc/mmc.c when CONFIG_GENERIC_MMC is enabled.
The sunxi Kconfig case is an oddball because it redefines
SPL_MMC_SUPPORT.

Signed-off-by: Alexandru Gagniuc <alex.g@adaptrum.com>
[trini: Update arch/arm/cpu/armv8/zynqmp/Kconfig]
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/board/sunxi/Kconfig b/board/sunxi/Kconfig
index 3e0e262..a667c9e 100644
--- a/board/sunxi/Kconfig
+++ b/board/sunxi/Kconfig
@@ -3,6 +3,7 @@
 config IDENT_STRING
 	default " Allwinner Technology"
 
+# FIXME: Should not redefine these Kconfig symbols
 config PRE_CONSOLE_BUFFER
 	default y
 
@@ -19,6 +20,7 @@
 	default y
 
 config SPL_MMC_SUPPORT
+	depends on SPL && GENERIC_MMC
 	default y
 
 config SPL_POWER_SUPPORT