ARM: dts: msm: Update the clock_gcc node on SM6150

Update the GCC clock controller device node to register to
actual GCC driver. Also update the GCC GDSCs by replacing
the dummy nodes with actual GDSC regulator driver.

Change-Id: I15197e2d84a8ae4497020e3aff9252c0e02ef9e2
Signed-off-by: Amit Nischal <anischal@codeaurora.org>