BACKPORT: scsi: ufs: Refactor ufshcd_setup_clocks() to remove skip_ref_clk

Remove the param skip_ref_clk from __ufshcd_setup_clocks(), but keep a flag
in struct ufs_clk_info to tell whether a clock can be disabled or not while
the link is active.

Bug: 188004633
Change-Id: I7b0e48923a6e24edf23dd674061caee55ca4df67
(cherry picked from commit 81309c24)
[Stanley: Resolved minor conflict in drivers/scsi/ufs/ufshcd.c]
Link: https://lore.kernel.org/r/1606356063-38380-2-git-send-email-cang@codeaurora.org


Reviewed-by: Hongwu Su <hongwus@codeaurora.org>
Reviewed-by: Bean Huo <beanhuo@micron.com>
Reviewed-by: Stanley Chu <stanley.chu@mediatek.com>
Signed-off-by: Can Guo <cang@codeaurora.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>