Fix build time warning

Fixes warning:
system/sepolicy/public/install_recovery.te:14:WARNING 'unrecognized character' at token ''' on line 13335:
allow install_recovery vendor_file:file { { getattr open read ioctl lock } { getattr execute execute_no_trans } };'

Bug: 37105075
Test: Fugu policy builds without this warning.
Change-Id: I8f417c51a816f3983a918c7e36dd804c5b85543f