Add QCOM_BSP flag to use QCOM BSP with commands the AOSP one does not have

Change-Id: I1d6aefe76ab561060310dec44e2ccc9b007559fd
Add fstab back to common since it is loaded by init.qcom.rc and thus doesnt need to be loaded by the specific device inits

Change-Id: I0cc37eca01082428cde413a455158a6237bf65d6