mmc: sunxi: revive depends on UART0_PORT_F

Commit f401e907 ("ARM: sunxi: remove bare default for
CONFIG_MMC") dropped "depends on UART0_PORT_F", but it is still
needed.  Revive it as a prerequisite of CONFIG_MMC_SUNXI.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>

drivers/mmc/Kconfig

@@ -299,7 +299,7 @@ config MMC_SDHCI_TEGRA
 
 config MMC_SUNXI
 	bool "Allwinner sunxi SD/MMC Host Controller support"
-	depends on ARCH_SUNXI
+	depends on ARCH_SUNXI && !UART0_PORT_F
 	default y
 	help
 	  This selects support for the SD/MMC Host Controller on