scsi: ufs-msm: Add hba->vops->clk_scale_notify()

Add hba->vops->clk_scale_notify() to get notified about clock
scaling and thus to configure phy timers and to update the
bus bandwidth vote accordingly.

Change-Id: I2f0cae8e787d0b4e764dc210db035add880428ce
Signed-off-by: Sahitya Tummala <stummala@codeaurora.org>