msm: perf: Fix standalone compilation

Include perf_trace_counters header file in trace directory to
avoid compile errors when compiling standalone kernel image.

Change-Id: I4cb2928e37357eb6bf5f4118858f558dbe2f7f99
Fix build for GCC 4.7

Change-Id: I4e9265369174d82b55fd435bc47887972f94c9d4