clk: msm: clock-alpha-pll: Conditionalize the offline-request workaround

Not all chipsets require the offline bit workaround when
programming HW-FSM controlled alpha PLLs. Conditionalize
this workaround, with the default condition being that
the workaround is not required.

Change-Id: I423739c34872f7296cfb08784eda5898aa65993a
Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org>