msm7x27a-coomon: Add support for jellybean  bootloaders (1/20)

Change-Id: Id2ce21e1ba27553c5f98d2aa112791375b892f1f
msm7x27a-common: Add TARGET_ENABLE_QC_AV_ENHANCEMENTS flag

- Enable TARGET_ENABLE_QC_AV_ENHANCEMENTS flag to plugin QC
  specific video enhancements

Change-Id: Ic4ab6818a0acc9d6b0841f42ae8f86d2e8eb7c77