STiH410: Add STi SDHCI driver

Add SDHCI host controller found on STMicroelectronics SoCs

On some ST SoCs, i.e. STiH407/STiH410, the MMC devices can live
inside a dedicated flashSS sub-system that provides an extend subset
of registers that can be used to configure the Arasan MMC/SD Host
Controller.

This means, that the SDHCI Arasan Controller can be configured to be
eMMC4.5 or 4.3 spec compliant.

W/o these settings the SDHCI will configure and use the MMC/SD
controller with limited features e.g. PIO mode, no DMA, no HS etc.

Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index bde969d..20434dc 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1098,6 +1098,8 @@
 	select CPU_V7
 	select DM
 	select DM_SERIAL
+	select BLK
+	select DM_MMC
 	help
 	  Support for STMicroelectronics STiH407/10 SoC family.
 	  This SoC is used on Linaro 96Board STiH410-B2260