ARM: dts: msm: Correct the regulator handles for MSM8920 QRD board

The later inclusion of msm8937-regulator.dtsi file in
msm8920-qrd.dtsi overrides the 8920 specific MEM ACC and
CPR configuration with that of 8937 specific configuration
which eventually result in device under-volt scenarios and
cause devices to crash. So remove the msm8937-regulator.dtsi
file inclusion and update the regulator handles used in
msm8920-qrd specific dtsi files.

CRs-Fixed: 1107872
Change-Id: I27179afa9e535c89ee89bbd7e697da750b2e7f9f
Signed-off-by: Lijuan Gao <lijuang@codeaurora.org>