selftests: landlock: Add the uapi headers include variable

Out of tree build of this test fails if relative path of the output
directory is specified. Add the KHDR_INCLUDES to correctly reach the
headers.

Signed-off-by: Muhammad Usama Anjum <usama.anjum@collabora.com>
Reviewed-by: Mickaël Salaün <mic@linux.microsoft.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>