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