sepolicy: allow powerhal to access vendor_mm dir

Error log:
auditd  : type=1400 audit(0.0:79): avc:  denied  { search } for  comm="NodeLooperThrea" name="vendor_mm" dev="sysfs" ino=56518 scontext=u:r:hal_power_default:s0 tcontext=u:object_r:sysfs_vendor_mm:s0 tclass=dir permissive=0

Bug: 322916612
Test: check avc logs
Flag: EXEMPT bugfix
Change-Id: I0fa6ba0a11551646d76b65ec764b25cd697d0364
1 file changed