msm: kgsl: Add a ftrace event for adreno context switches

It is useful to track context switches since they are expensive
and we would like to have as few as possible.

Change-Id: Ic0dedbad6befc84193b17851a9db4ff87e656cc7
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
2 files changed