msm: clock-pll: Move 8930, 8064 and 9615 pll config code to clock-pll.

Code to configure PLLs and to switch them to FSM
mode has been duplicated in clock drivers for the
9615 and 8064. Move this out to the common clock-pll
driver so that the code can be re-used for these
and future targets.

Change-Id: Ia77e976d277837f5a2d344f82f05cca4261dcf9d
Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org>