msm: kgsl: Add the always on timer as an honorary perfcounter

The always on timer isn't a perfcounter but it might play one on TV.
Add it to the perfcounter lists so that it can be treated as one by
the user mode driver.

CRs-Fixed: 729520
Change-Id: Ic0dedbad728f1695bc23a12699e58d90e42f77fa
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>