clk: qcom: clk-alpha-pll: Add clk_alpha_pll_lucid_5lpe_sdx_cpu_ops

The lucid_5lpe PLL used for the CPU on SDX targets uses a custom
mechanism to assert the latch. Add ops that can be used for this.

Change-Id: I24f8e3db2b908e34e4d0560841f1f5fdcfd215af
Signed-off-by: Mike Tipton <mdtipton@codeaurora.org>