coresight: etm4x: Add support for Marvell OcteonTX2

commit 3928428b9780cb8b13b830158ea75d622ae8705b from
git@git.assembla.com:cavium/WindRiver.linux.git

Add device ID for Marvell OcteonTX2 CN9xxx device.
This device has a few quirks and added a new coresight-quirks.c
file to handle the hardware quirks which are as follows:

- OcteonTX2 reports ETM version as ETMv4.2 but it supports
  Ignore Packet feature of ETM4.3. Treat the device as compatible
  with ETM4.3.

- The hardware does not implement periodic trace sync packet
  insertion. Hence add helper APIs to support sync packet
  insertion via software.

Change-Id: I5643ed2b8e44b0f5cb3decee8e71be64d8d1b7c6
Signed-off-by: Tanmay Jagdale <tanmay@marvell.com>
Signed-off-by: Ruiqiang Hao <Ruiqiang.Hao@windriver.com>