Add SDHCI support for STMicroelectronics SoCs

[Lee Jones]

> > >Initially it supports the stih416 and stih415 SoCs, and has
> > >been tested on a stih416-b2020 board.
> > 
> > In next version, could you also add  drivers/mmc/host/sdhci-st.c in
> > the ARM/STI ARCHITECTURE field of MAINTAINERS file?
> 
> Was out on hols last week. I have fixed it in v2.

This should be in its own patch.

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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