msm: jtag: query for TZ dbg-etm register save and restore support

Only perform a save and restore of debug and etm registers across
power collapse in the kernel if debug and etm architecture is
supported by the code and if TZ isn't supporting the save and
restore.

Change-Id: I2234cda6dcc488ef8a8895e2fbfdf5e4251fb5aa
Signed-off-by: Pratik Patel <pratikp@codeaurora.org>