Remove extra flags

Does more harm than good.
Add HTC RGBA offset flag & enable refresh rate

For use with this commit:
https://github.com/Team-Hydra/android_hardware_qcom_display-legacy/commit/e2d3fae4825f0b1ca2a5ff8ad4cdd9601407cbca

Our device uses an outdated kernel and doesn't seem to report the
correct refresh
rate to gralloc, with this flag and a patch to display-legacy it can be
manually
declared