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/arch/arm/cpu/armv8/zynqmp/Kconfig b/arch/arm/cpu/armv8/zynqmp/Kconfig
index 499e1dd..5ac48eb 100644
--- a/arch/arm/cpu/armv8/zynqmp/Kconfig
+++ b/arch/arm/cpu/armv8/zynqmp/Kconfig
@@ -13,7 +13,7 @@
 	default y
 
 config SPL_MMC_SUPPORT
-	default y
+	default y if MMC_SDHCI_ZYNQ
 
 config SPL_SERIAL_SUPPORT
 	default y