perf test: Fix a typo in cs-etm testing

Fix a typo: s/devce_name/device_name.

Fixes: fe0aed19b266 ("perf test: Introduce script for Arm CoreSight testing")
Signed-off-by: Leo Yan <[e-mail]>
Reviewed-by: Mathieu Poirier <[e-mail]>
Cc: Alexander Shishkin <[e-mail]>
Cc: Jin Yao <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: Mark Rutland <[e-mail]>
Cc: Mike Leach <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: Suzuki Poulouse <[e-mail]>
Cc: coresight ml <[e-mail]>
Cc: [e-mail]
Link: http://lore.kernel.org/lkml/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/tests/shell/test_arm_coresight.sh

···
 		#     `> device_name = 'tmc_etf0'
 		device_name=$(basename $path)
 
-		if is_device_sink $path $devce_name; then
+		if is_device_sink $path $device_name; then
 
 			record_touch_file $device_name $2 &&
 			perf_script_branch_samples touch &&