RMX1971: Disable display refresh rate override

This got enabled by default on U, and it causes apps like
Chrome and Youtube to set the refresh rate to 30FPS when
playing some videos.

Change-Id: I649bf03d550c2b9726c7957d15ed09e455d874ec
Signed-off-by: adi8900 <adrianszymanski242@gmail.com>
Signed-off-by: kaderbava <ksbava7325@gmail.com>