clk: qcom: alpha-pll: Add support for hwfsm ops

Add support to enable/disable the alpha pll using hwfsm.
Also add support for initial configuration (needs to be split).

Change-Id: Ifc2fe0539b943e850681143da76da27274203ed2
Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
Signed-off-by: Taniya Das <tdas@codeaurora.org>