allow init to read symlinks in sys

avc: denied { read } for name="device" dev="sysfs" ino=36099 scontext=u:r:init:s0 tcontext=u:object_r:sysfs_rmtfs:s0 tclass=lnk_file

init is already allowed to read directories, this is an obvious omission.

Change-Id: I5131a84bb67e73aaed235c3cbab95c365eaaa2f0

init.te

@@ -199,6 +199,7 @@ allow init self:capability sys_boot;
 
 # Write to sysfs nodes.
 allow init sysfs_type:dir r_dir_perms;
+allow init sysfs_type:lnk_file read;
 allow init sysfs_type:file w_file_perms;
 
 # disksize