msm: mpq8064: Allow power up and down to be more dynamic

To save power regulators are only powered on when needed. Also in
this change is that clock rate is not longer set to max rate.
Clock speed set to lowest rate and still remain properly functional

Change-Id: I7141c8d630e4dbf5c2593e0aea9a18dc3866a1fd
Signed-off-by: Terence Hampson <thampson@codeaurora.org>