ARM: dts: msm: optimize CPR configurations for msm8226-v1/v2 and msm8926

Move common CPR regulator configurations for msm8226-v1, msm8226-v2, and
msm8926 into msm8226-regulator.dtsi. Move msm8226-v1 specific
configurations into msm8226-v1.dtsi since most CPR configuration parameters
are common between msm8226-v2 and msm8926.

Change-Id: I043a310aa433ba8f8cf4dd17dc1ef99de1f99b89
Signed-off-by: Ke Liu <keliu@codeaurora.org>