Add device tree bindings for QBG driver. Change-Id: Ibef732b3fbefc4e52348277a0c2e0577a437fd87 Signed-off-by: Ayyagari Ushasreevalli <quic_aushasre@quicinc.com> Signed-off-by: Umang Chheda <quic_uchheda@quicinc.com>