Some UFS memory devices needs their reset line toggled in order to get them
into a good state for initialization. Provide a new vops to allow the
platform driver to implement this operation.

Link: https://lore.kernel.org/r/20190828191756.24312-2-bjorn.andersson@linaro.orgSigned-off-by: NBjorn Andersson <bjorn.andersson@linaro.org>
Reviewed-by: NAlim Akhtar <alim.akhtar@samsung.com>
Reviewed-by: NBean Huo <beanhuo@micron.com>
Reviewed-by: NStanley Chu <stanley.chu@mediatek.com>
Acked-by: NAvri Altman <Avri.Altman@wdc.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>