[U-Boot] mmc: stm32_sdmmc2: update pwron management

[Tom Rini]

On Wed, Jun 27, 2018 at 10:49:31AM +0200, Patrice Chotard wrote:

> From: Patrick Delaunay <patrick.delaunay at st.com>
> 
> Correctly manage the SDMMC reset and card cycle power
> to fully handle the power cycle added in the MMC uclass
> and avoid issue with level-shifter with some uSDCARD.
> 
> 3 states managed in driver:
>   1/ reset: SDMMC disable, signal HiZ
>   2/ power-cycle: SDMMC disable, signals drive to 0
>   3/ power-on: SDMMC enabled
> 
> Signed-off-by: Patrick Delaunay <patrick.delaunay at st.com>
> Signed-off-by: Patrice Chotard <patrice.chotard at st.com>

Applied to u-boot/master, thanks!

-- 
Tom
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