[art] Yama LSM isn't mandatory

Some machines building debug builds don't have YAMA enabled (and it
doesn't seem to be mandatory for running/testing ART debug builds)

Test: ./test/testrunner/testrunner.py -b --host -t 001-HelloWorld

Change-Id: I1aa258380ddbf8c4f59ea22a9d901169ba448ef8
1 file changed