clk: qcom: clk-cpu-osm: correct the logic to check per-core DCVS status

This change would fix the logic to check the status of per-core DCVS
from the CORE_DCVS_CTRL register.  

Change-Id: I0b2b36fe86d265d6e7f34f8acde19f8f02c0371a
Signed-off-by: Amit Nischal <anischal@codeaurora.org>