coresight: 9625: Modify ETM driver to support ETMv3.5

MSM9625 implements ETM based on ETM version 3.5.
As such the 9625 ETM registers need some additonal configuration
for ETM to be functional. They also have some extra registers which
need to be configured properly while some registers currently being
configured by the driver are absent on 9625. Additonally, the ETMv3.5
can be configured to support data tracing, support for which is
not present in the existing ETM driver.

Change-Id: Ic3e61d0d1abf371653a398a28111b308747a7b6f
Signed-off-by: Pushkar Joshi <pushkarj@codeaurora.org>