msm: kgsl: Return -ENOTTY for legacy waittimestamp calls

Return -ENOTTY Instead of returning -EINVAL for depcreated
legacy waittimestamp so the userspace caller understands that
the functionality no longer exists.

Change-Id: Ic0dedbad49faf4b85d7a2939ba83169ededc9eff
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>