Revert "msm: kgsl: Prevent dual ownership of GMU counters"

The GMU firmware team does not currently use the counters that are
reserved for them, so they are allowing them to be reclaimed
by KGSL for the purpose of monitoring the throttled clock cycles.

This reverts commit 9d57d42d.

Change-Id: I15e75f77188e91ecdbcf1ea1e2458d1f65122dfb
Signed-off-by: Kyle Piefer <kpiefer@codeaurora.org>