ARM: dts: msm: Add the timeout properties to SMMU GDSCs on MSM8996

The votable SMMU GDSCs might take longer to enable than the
default limit of 100usecs depending on the clock WAKE and SLEEP
settings and the clock rates. Make this polling timeout limit
more configurable.

Change-Id: I26cb00cefa5d45ed2a92f306921e2d95938795af
Signed-off-by: Deepak Katragadda <dkatraga@codeaurora.org>