clk: qcom: support Huayra type Alpha PLL

clk: qcom: support Huayra type Alpha PLL

The Huayra type Alpha PLL  has a 16 bit alpha value, and
depending on the alpha_mode, the alpha value can be treated as
M/N value or as a two’s compliment number. This PLL supports
dynamic programming.

Since the decoding of alpha val and dynamic programming are
completely different from other Alpha PLLs we add separate
functions for Huayra PLLs.

Signed-off-by: Abhishek Sahu <absahu@codeaurora.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>