coresight: coresight tmc driver

This driver manages CoreSight TMC (Trace Memory Controller) which
can be pre-configured as an ETF (Embedded Trace FIFO) or ETR
(Embedded Trace Router). ETF when configured in circular buffer mode
acts as an ETB (Embedded Trace Buffer).

Change-Id: I1ca40e1fbd3049dc7addb834c064ab3a6c4c22e0
Signed-off-by: Pratik Patel <pratikp@codeaurora.org>