pinctrl:uphy: adopt pll hw APIs of clock framework

pinctrl:uphy: adopt pll hw APIs of clock framework

Adopt pll hw APIs from clock framework to avoid direct
CAR register accessing in uphy driver

Also removed uphy_pll_hw_sequencer_disable per suggestion
from HW team that there is no HW sequencer power down
sequence hence SW could not disable HW sequencer once it's
enabled.

Bug 200241611
Bug 1837378

Change-Id: I431f23f3156a3472bbc8694c6147b6b3a87b40a2
Signed-off-by: BH Hsieh <bhsieh@nvidia.com>
Reviewed-on: http://git-master/r/1241566
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Ashutosh Jha <ajha@nvidia.com>