Add the REFGEN_VDD_A_0P9/VDD_A_PCIE_0_0P9 regulator so that the
ufs phy driver can vote for this regulator. This vote is needed
according to the Sun's Power Grid Analysis document.
Change-Id: I3427e2f529ec734983ea6c2db97411c997260bb0
Signed-off-by: Bao D. Nguyen <quic_nguyenb@quicinc.com>