ARM: dts: qcom: remove mode control from L7F regulator for Kona

PMIC PM8009 LDO regulator L7F needs to stay in bypass mode at all
times so that it acts as a switch.  The bootloader initializes
its mode to bypass.  Thus, remove all mode control capabilities
from the rpmh-regulator device for this regulator to avoid
overriding the default bypass mode.

Change-Id: I5d7bf66b1c3c4d32a22eecea760f1271078bf1f4