ARM: dts: msm: add PM8009 regulator devices for SDM855

Add the following XOB managed RPMh regulator devices:
SMPS 2, LDO 2, LDO 5, and LDO 6.

Only the enable state of these regulators can be controlled
at runtime.

Change-Id: I9165f45f51179e39110095b1f7ea29249962a48c
Signed-off-by: David Collins <collinsd@codeaurora.org>