scsi: ufs: Update UFS ICE clock enable/disable sequence

As per latest hardware programming guide, during
Hibern8 enter with power collapse:
SW should disable HW clock control for UFS ICE clock
(GCC_UFS_ICE_CORE_CBCR.HW_CTL=0), before ufs_ice_core_clk
is turned off (i.e GCC_UFS_*_ICE_CORE_CBCR[CLK_ENABLE]=0)
and vice versa during hibern8 exit.
This change updates UFS ICE clock disable sequence as per
recommended steps.

Change-Id: Ibe2036bb20a4e0ec368fc203da9553c10c02200d
Signed-off-by: Sayali Lokhande <sayalil@codeaurora.org>
Signed-off-by: Ram Prakash Gupta <rampraka@codeaurora.org>