msm7x27a-common: remove power hal from device tree

Change-Id: I5c36c0199fef2e8647ae570c2c162020ef51240f
msm7x27a-common: remove prebuilt wifi modules from common folder

Change-Id: I31cf63eb0a25af32d51cfdb36ba4e2e05d6ad7d6
msm7x27a-common: clean up header

keep ion,mdp and kgsl header as a fallback

Change-Id: Iedcb5000798407076dd4f229a2102d821ee190f0