coresight: etm4x: add a tweak of TRCDEVARCH to support Ignore Packet feature

The tweak of TRCIDR1 introduced by commit 233b9a7d ("coresight:
etm4x: Add support for Marvell OcteonTX2") was dropped by commit
7b579662 (coresight: etm4x: Drop the useless tweak of TRCIDR1),
This will loss the original Ignore Packet feature, so we use a tweak
of TRCDEVARCH to support this feature again.

Signed-off-by: Ruiqiang Hao <Ruiqiang.Hao@windriver.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>