Restrict isolated_app's /sys access

isolated_app is strictly limited on the files in /sys which can be
accessed.

Test: policy compiles.
Change-Id: I9f3c00a98cd8c08a3968d8e565bf56b4670a780f
diff --git a/sepolicy/domain.te b/sepolicy/domain.te
index bddbd2f..d09fe8d 100644
--- a/sepolicy/domain.te
+++ b/sepolicy/domain.te
@@ -1,2 +1,2 @@
 allow domain sysfs_socinfo:dir r_dir_perms;
-allow domain sysfs_socinfo:file r_file_perms;
+allow { domain -isolated_app } sysfs_socinfo:file r_file_perms;