mmc: Kconfig: Add Arasan SDHCI entry

Add Arasan SDHCI entry to Kconfig and fix all references.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/configs/xilinx_zynqmp_ep_defconfig b/configs/xilinx_zynqmp_ep_defconfig
index 2811918..c2bbb47 100644
--- a/configs/xilinx_zynqmp_ep_defconfig
+++ b/configs/xilinx_zynqmp_ep_defconfig
@@ -25,5 +25,6 @@
 CONFIG_CMD_TIMER=y
 CONFIG_OF_EMBED=y
 CONFIG_NET_RANDOM_ETHADDR=y
+CONFIG_ZYNQ_SDHCI=y
 CONFIG_ZYNQ_GEM=y
 # CONFIG_REGEX is not set