msm: clock: Move out pll code from clock-local.c to clock-pll.c

The new clock-pll driver is designed to control
PLL clocks including shared, locally controlled
and voteable PLLs. Move PLL code from clock-local.c
into this new driver.

Change-Id: I58fc0c7e4816e52d25dd2521a70baff52d8a74b2
Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org>