ARM: dts: msm: add rtb trace support for msmtellurium

Add RTB support to device tree node which enables RTB logging on
msmtellurium. RTB logging provides useful debug information by logging
events to uncached buffer which can be processed from ramdumps in case
of device reset.

Change-Id: Ib8731ab87f9120aa5a9ef6cc7e54c5bc8ade2494
Signed-off-by: Xiaogang Cui <xiaogang@codeaurora.org>