qcom-common: allow use of aosp repo (2)

Change-Id: Ifd7855ee7fdd447767fc61b8c53e74adf954cbaa
camera: add proper iso cflag

required for building w/o:

COMMON_GLOBAL_CFLAGS += -DQCOM_HARDWARE
BOARD_USES_QCOM_HARDWARE := true

Change-Id: I7f952f75f0d5c2f8aef74a8d691f2fe70b9b4df8
restore Camera(2) overlay

Change-Id: I33664d909d29ffaa4fff9a1e443265e4e88126d8