msm: kgsl: Ignore EAGAIN when programming perfcounter

When programming perfcounter via gpu commands, we may encounter
-EAGAIN because of cancelling rb events either due to soft reset
or when powering down the device. Ignore this error because we
have already set up the perfcounter in software and it will be
programmed in hardware by adreno_perfcounter_restore when gpu
comes back up.

CRs-Fixed: 1024199
Change-Id: I5dc3561d15fa50ac58646f96559cfd262020dda9
Signed-off-by: Harshdeep Dhatt <hdhatt@codeaurora.org>