ARM: dts: msm: Disable rpm logs and stats on MSM8994

RPM logs and stats are not yet supported on this target. Delete these
entries from the device tree until the underlying infrastructure is ready
and validated.

Change-Id: Ic1d5fd9c6717f1ecabb2ea2178fb4bac203f03aa
Signed-off-by: Karthik Parsha <kparsha@codeaurora.org>