clk: msm: gdsc: Add the "qcom,gds-timeout" DT property for GDSC polling

Instead of hard-coding the GDSC polling timeouts, use the
"qcom,gds-timeout" property to load the desired values.
These polling times vary for the votable GDSCs especially
depending on the sequence, clock rates and the clock SLEEP
and WAKEUP settings.

Change-Id: Id43ce13fcb5f386d5659280f2b561b6065eb0248
Signed-off-by: Deepak Katragadda <dkatraga@codeaurora.org>