add BoardConfig flag TARGET_USES_OPENGLES_FOR_SCREEN_CAPTURE

This flag forces usage flags:
GRALLOC_USAGE_HW_TEXTURE and GRALLOC_USAGE_HW_RENDERER
in captureScreenImplLocked regardless of useReadPixels value

This fixes the EGL_NO_IMAGE_KHR error returned from
eglCreateImageKHR (blank images returned from screenshot path)

Change-Id: Ia782a918501b4fd40a58eef71c404584a44b8073
Merge tag 'android-4.4.1_r1' into HEAD

Android 4.4.1 Release 1
Merge "add BoardConfig flag TARGET_USES_OPENGLES_FOR_SCREEN_CAPTURE" into cm-11.0
Merge commit '4.4.1_r1' into HEAD
Revert "add BoardConfig flag TARGET_USES_OPENGLES_FOR_SCREEN_CAPTURE"

This reverts commit db66fbf4acbe098dc52534378ed33694a63f3ffd.
Turns out the test results in the GN were skewed by another bug. We _can_ just remove the useReadPixels check and do away with the need for a board flag

Change-Id: I084e7bbf4c2435b9656fa30e7ce130237b7f57c5
sf: Always use opengles for screen capture

Go back to the usage of GRALLOC_USAGE_HW_TEXTURE and GRALLOC_USAGE_HW_RENDERER
in captureScreenImplLocked regardless of useReadPixels value

This fixes the EGL_NO_IMAGE_KHR error returned from
eglCreateImageKHR (blank images returned from screenshot path)

Change-Id: I62fe90a081607b9e89c67f3dcfd34c84efc89d35
Merge remote-tracking branch 'cm/cm-11.0' into HEAD