clk: qcom: clk-alpha-pll: check pcal_done from mode register

The sequence for alpha_pll_lucid_prepare is checking an incorrect bit
to determine whether or not a lucid PLL has calibrated successfully.
The bit in the status register is not observable unless pll_test_ctl[69]
is set and user_ctl[43:37] is 0 which should only be used as a fallback
option. Use the correct PCAL_DONE bit from the mode register to properly
determine PLL calibration status.

Change-Id: If952c30cacacd68c07e8d7dfd622069dbb70c909
Signed-off-by: David Dai <daidavid1@codeaurora.org>