Some target require refgen to operate. For this an additional ldo
which will be exposed and the driver need to vote for proper phy
functionality.
Add a phandle which will be used in the driver to identify the
ldo and vote accordingly.
Change-Id: I15b3bcb031cefe037fbb0364bfb7b87d26489006
Signed-off-by: Udipto Goswami <quic_ugoswami@quicinc.com>