clk: qcom: clock-alpha-pll: Add support for sleep enabled pll

Add new clock ops to be used by sleep enabled PLLs. It will clear the sleep
enable bit for the pll on enable and assert the sleep enable bit on
disable, when the regmap flag enable_is_inverted is set from the PLLs.

Change-Id: Iae68fb7e7e62230d029a16c32ef6b0530333ad6c
Signed-off-by: Shefali Jain <shefjain@codeaurora.org>