ARM: dts: msm: Add TMC reg dump entries for SDM845

Add TMC ETF and ETR entries to the memory dump device. These
entries can be used to dump out the register space on the device
in case of a crash.

Change-Id: I75e65dc3e66a62ac130aeea111e048ded9106cfe
Signed-off-by: Satyajit Desai <sadesai@codeaurora.org>