Revert "msm7x27a-common: build power hal"

This reverts commit 1842df3df145bb84c217a0ef33460d2a16d02388.
msm7x27a-common: updates

Change-Id: I3454c87ae68b14cb54bb0d19ee1e5bbd3413de04
msm7x27a-common: sync headers with kernel

Change-Id: Ia94b09357a395c6849006cda6b20380050e3542a
msm7x27a-common: use new-ion api

Change-Id: Iab7c1a08eb7b7103cfc48f388b02c0c307302e63