update PMIC GPIO binding documentation to include compatible string for PMX35 PMIC. Change-Id: Ifeea36b51f12e189bce0ed97664e6d3b3f51a6ed Signed-off-by: Kavya Nunna <quic_knunna@quicinc.com> Signed-off-by: Satya Priya Kakitapalli <quic_skakitap@quicinc.com>