defconfig: msm9x25: enable trace events

Enables kernel tracing allowing trace event based debugging.
The trace events get recorded in an internal ring buffer and
can be configured and manipulated from user space using debugfs.

Change-Id: I9ef84d5b25cd966d947601aa499a1c5f7e59ab98
Signed-off-by: Pushkar Joshi <pushkarj@codeaurora.org>