clk: qcom: clk-alpha-pll: add support to reconfigure PLLs during prepare

Under some circumstances, such as during subsystem restart, the
registers for a clock controller may be reset to hardware default
values.  Add support to reconfigure a Lucid PLL during clk_prepare
in the case that the CAL_L_VAL is found to be 0 before performing
calibration.

Change-Id: Idef3c42dfb32748ec40f89a9dab9f6ab86e293f6
Signed-off-by: David Collins <collinsd@codeaurora.org>