perf test stat csv: Update test expectations and events

Explicitly use a metric rather than implicitly expecting '-e
instructions,cycles' to produce a metric. Use a metric with software
events to make it more compatible.

Signed-off-by: Ian Rogers <[e-mail]>
Signed-off-by: Namhyung Kim <[e-mail]>

tools/perf/tests/shell/lib/stat_output.sh

···
 		echo "[Skip] CPU-measurement counter facility not installed"
 		return
 	fi
-	perf stat --metric-only $2 -e instructions,cycles true
+	perf stat --metric-only $2 -M page_faults_per_second true
 	commachecker --metric-only
 	echo "[Success]"
 }

tools/perf/tests/shell/stat+csv_output.sh

···
 	;; "--per-die")		exp=8
 	;; "--per-cluster")	exp=8
 	;; "--per-cache")	exp=8
-	;; "--metric-only")	exp=2
+	;; "--metric-only")	exp=1
 	esac
 
 	while read line