testcases: kselftest-mm: adding new test case kselftest mm

Introduced a standalone test case for memory management selftests,
enabling users to execute it independently.

The pre-required Kconfig for these testcases are listed in
 selftests/mm/config

Link: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/plain/tools/testing/selftests/mm/config

Signed-off-by: Naresh Kamboju <naresh.kamboju@linaro.org>

lava_test_plans/testcases/kselftest-mm.yaml

@@ -0,0 +1,4 @@
+{% extends "testcases/templates/kselftest.yaml.jinja2" %}
+
+{% set testnames = ['mm'] %}
+{% set test_timeout = 10 %}