perf tools: Only include tsc file for x86

The perf_time_to_tsc and tsc_to_perf_time functions are only used for x86.

Make inclusion of tsc.c dependent on x86 as well.
Signed-off-by: David Ahern <david.ahern@oracle.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <david.ahern@oracle.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Link: http://lkml.kernel.org/r/1424370153-128274-1-git-send-email-david.ahern@oracle.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/Build

@@ -71,7 +71,7 @@ libperf-y += stat.o
 libperf-y += record.o
 libperf-y += srcline.o
 libperf-y += data.o
-libperf-y += tsc.o
+libperf-$(CONFIG_X86) += tsc.o
 libperf-y += cloexec.o
 libperf-y += thread-stack.o