ANDROID: GKI: add ufshcd_config_pwr_mode

Sometimes, ufs host exits from hibern8 with low speed
even if it start with high speed. In the case, a module
needs to call ufshcd_config_pwr_mode to sustain
IO performance.

Bug: 188122907
Signed-off-by: Kiwoong Kim <kwmad.kim@samsung.com>
Change-Id: I5e2cdcd5f36b7328f3543ba3225b95733f12bd0d