mmc: zynq: rename CONFIG_ZYNQ_SDHCI to CONFIG_MMC_SDHCI_ZYNQ

Make the naming scheme consistent; all SDHCI-base drivers prefixed
with CONFIG_MMC_SDHCI_.

While we are here, add "depends on ARCH_ZYNQ || ARCH_ZYNQMP".

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/arch/arm/mach-zynq/Kconfig b/arch/arm/mach-zynq/Kconfig
index c465918..2529c9f 100644
--- a/arch/arm/mach-zynq/Kconfig
+++ b/arch/arm/mach-zynq/Kconfig
@@ -13,7 +13,7 @@
 	default y
 
 config SPL_MMC_SUPPORT
-	default y if ZYNQ_SDHCI
+	default y if MMC_SDHCI_ZYNQ
 
 config SPL_SERIAL_SUPPORT
 	default y