selftests: change cpu on-off-test.sh name to be unique

cpu and memory hotplug scripts use the same name. Change
cpu on-off-test.sh to cpu-on-off-test.sh.
Signed-off-by: NShuah Khan <shuahkh@osg.samsung.com>
Acked-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

tools/testing/selftests/cpu-hotplug/Makefile

 all:
 
-TEST_PROGS := on-off-test.sh
+TEST_PROGS := cpu-on-off-test.sh
 
 include ../lib.mk
 
 run_full_test:
-	@/bin/bash ./on-off-test.sh -a || echo "cpu-hotplug selftests: [FAIL]"
+	@/bin/bash ./cpu-on-off-test.sh -a || echo "cpu-hotplug selftests: [FAIL]"
 
 clean: