sepolicy: Add rules for /sys/kernel/mm/pgsize_migration/enabled

The dynamic linker needs to read this node to determine how it should
load ELF files.

Allow the node to be enabled/disabled by init.

Bug: 330117029
Bug: 327600007
Bug: 330767927
Bug: 328266487
Bug: 329803029
Test: Free Fire Chaos App launches
Test: no avc deined in logcat
Change-Id: I2b35d6aebe39bf3e1e7489b47f23a817e477ef72
diff --git a/private/isolated_app_all.te b/private/isolated_app_all.te
index 1ffcabe..8c1fdcb 100644
--- a/private/isolated_app_all.te
+++ b/private/isolated_app_all.te
@@ -100,6 +100,7 @@
   -sysfs_usb # TODO: check with audio team if needed for isolated_apps (b/28417852)
   -sysfs_fs_fuse_features
   -sysfs_fs_incfs_features
+  -sysfs_pgsize_migration
 }:file no_rw_file_perms;
 
 # No creation of sockets families other than AF_UNIX sockets.