clk: msm: clock-cpu-8996: Correct the ACS configuration logic

Correct the settings to switch to always-on clock source
during certain LPM mode exit paths on msm8996 Pro.

CRs-Fixed: 972298
Change-Id: Ice256b453fad07bc80be79d9c15d10545c90fb20
Signed-off-by: Deepak Katragadda <dkatraga@codeaurora.org>