msm: kgsl: tracepoint cleanup

Use the same format for all trace points reporting the same
data, such as context ids (ctx=%u) and timestamps (ts=%u).
Make sure key=value format is used in a few places where it
was missing.

Change-Id: I4ec1c77c853c567c7a6ba69eff5023d8d71cdac4
Signed-off-by: Jeremy Gebben <jgebben@codeaurora.org>