selftests: Change memory on-off-test.sh name to be unique

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

tools/testing/selftests/memory-hotplug/Makefile

@@ -2,11 +2,11 @@ all:
 
 include ../lib.mk
 
-TEST_PROGS := on-off-test.sh
-override RUN_TESTS := ./on-off-test.sh -r 2 || echo "selftests: memory-hotplug [FAIL]"
+TEST_PROGS := mem-on-off-test.sh
+override RUN_TESTS := ./mem-on-off-test.sh -r 2 || echo "selftests: memory-hotplug [FAIL]"
 override EMIT_TESTS := echo "$(RUN_TESTS)"
 
 run_full_test:
-	@/bin/bash ./on-off-test.sh || echo "memory-hotplug selftests: [FAIL]"
+	@/bin/bash ./mem-on-off-test.sh || echo "memory-hotplug selftests: [FAIL]"
 
 clean: