ARM: dts: msm: Disable power collapse for msm8952

Disable PC for 2x based target on 3_18 based
video driver. 3_18 based video driver handles
PC for 3x based targets.

Change-Id: I7b4a99ba36f94fb52c93bd1b9722b7319b9e390f
Signed-off-by: Vikash Garodia <vgarodia@codeaurora.org>