ARM: dts: msm: use physical PMIC chips on SDM855 RUMI

Remove the simulated SPMI bus and simulated PMIC chips utilizing
it.  Ensure that PMIC slave devices are registered on the real
SPMI bus instead of the simulated bus.

Change-Id: I3b6799d6d787cb5288dd82474fd857affadc70de
Signed-off-by: David Collins <collinsd@codeaurora.org>