clk: qcom: Add ipq apss pll driver

The CPUs on Qualcomm ipq based devices are clocked by an alpha PLL.
Add support for the apss pll found on ipq based devices which can
support CPU frequencies above 1Ghz.

Signed-off-by: Sivaprakash Murugesan <sivaprak@codeaurora.org>
Link: https://lore.kernel.org/r/1592800092-20533-3-git-send-email-sivaprak@codeaurora.org
Signed-off-by: Stephen Boyd <sboyd@kernel.org>