FROMLIST: scsi: ufs-qcom: enter and exit hibern8 during clock scaling

Qualcomm controller needs to be in hibern8 before scaling clocks.
This change puts the controller in hibern8 state before scaling
and brings it out after scaling of clocks.

Bug: 143136976
Link: https://lore.kernel.org/lkml/1571849351-819-2-git-send-email-asutoshd@codeaurora.org/


Change-Id: I0a0903ff1dcc6edef1ac5ab32c3e943828b42a7e
Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>