clk: qcom: clk-alpha-pll: add FREQ_DET support to Zonda PLL lock detection

Some instances of the Zonda PLL do not lock correctly
in high L-VAL regions. In such cases, CFA mode
can be configured via test_ctl_val to use an alternative
locking mechanism. Add support for CFA mode by
polling FREQ_LOCK_DET instead of PLL_DET_LOCK
whenever CFA mode has been configured.

Change-Id: Ief31592250ea9f329a34ffdbc4b17cfce431677d
Signed-off-by: Vivek Aknurwar <viveka@codeaurora.org>