hwc: Dynamic Resolution support on Primary

    * Useful to estimate GPU/MDP performance for different resolutions.
    * MDP:
      Every layer is downscaled/upscaled to primary panel resolution.
    * GPU:
      All layers will be composed in required resolution to FB.
      FB is downscaled/upscaled to primary panel resolution.
    * Steps to follow:
          step 1: adb root
          step 2: adb shell setprop debug.hwc.fbsize XRESxYRES
          step 3: adb shell stop
          step 4: adb shell start

Change-Id: I82a032df87c91549c49a9cdbd981ff02f105ff2e
4 files changed