soc: qcom: msm_perf: Use unique names for per_cpu objects

When CONFIG_DEBUG_FORCE_WEAK_PER_CPU is enabled it forces each percpu
object to use a unique name even if they are declared as static.
Commit 0b100149 ("soc: qcom: msm_perf: Add msm_performance module")
added a per_cpu name that was identical to an existing module. Choose a
unique name instead.

Change-Id: Ic0dedbad5a531bc6a95d6c8ecdc92ddcb0527e56
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>