Set regulator-always-on for VDD_MMCX and VDD_MXC on Sun
RUMI. This ensures that clock controller register values
are maintained since RUMI isn't simulating register
retention across VDD_MMCX or VDD_MXC power collapse.
Change-Id: I5adaa243066df64f6f04f569a05eb124734d7611
Signed-off-by: Xubin Bai <quic_xubibai@quicinc.com>