Track vold cgroup denial in bug_map

avc: denied { write } for name="tasks" dev="tmpfs" ino=1998
scontext=u:r:vold:s0 tcontext=u:object_r:device:s0 tclass=file
permissive=0

Bug: 128336318
Test: n/a
Change-Id: Idd6fd2d729a320ea2e3edf46ce3d13d435468c50
Merged-In: Idd6fd2d729a320ea2e3edf46ce3d13d435468c50
(cherry picked from commit cafbcce03d43a9e9c5232c69bd54377776852a4f)