ARM: dts: msm: Add dt node to enable clock gating WA for MSM8939-V3.0

Core and L2 should be in quiescent state while enabling L1/L2 dynamic
clock gating. Implement a SW workaround to enable clock gating for boot
core and L2 which will get called when perf L2 is in power collapse.

Change-Id: I0f77a0e63b46cafdb94b2aeee70eff33b4b479a6
Signed-off-by: Srinivas Rao L <lsrao@codeaurora.org>
Signed-off-by: Anji Jonnala <anjir@codeaurora.org>
Signed-off-by: Sridhar Gujje <sgujje@codeaurora.org>
Signed-off-by: Bharat Pawar <bpawar@codeaurora.org>
Signed-off-by: Nirmal Abraham <nabrah@codeaurora.org>