ARM: dts: msm: Enable charging functionalities for MSM8937 SKU2

Move the battery and charger/FG enabling related device node into a dtsi
file to make sure every boards share the same dtsi file will have
battery charging/FG enabled.

Change-Id: I96faa7070f455ef19f3ea305531a442b2872f8be
Signed-off-by: Chunmei Cai <ccai@codeaurora.org>