coresight-etm4x: enable ETM driver on SDM845

Change traced-id values for ETMs. Remove comptability check
for minor version as the majority of ETMv4.0 driver code is
compatible with ETMv4.2. Add change to display upto 32 number
of proccessors available for tracing.

Change-Id: I340ebf203d53717f2d497e406d24acb146226556
Signed-off-by: Satyajit Desai <sadesai@codeaurora.org>