clk: msm: gdsc: Check the GDS_HW_CTRL register to determine if GDSC is ON

When a gdsc is enabled, check the GDSCs hw_ctrl register status
to determine if the GDSC is on. Just relying on the GDSC status
bit might lead to issues wherein the GDSC status bit might be
set but the GDSC hw_ctrl is still waiting on an ACK; leading to
NOC errors.

Change-Id: Idcdefa57a7cf0eda10e0501385aa8d7e8689f90f
Signed-off-by: Deepak Katragadda <dkatraga@codeaurora.org>