Grant radio domain access to vendor_file

"radio" domain hosts com.android.phone process which loads and runs
services from vendor APKs, such as ims, which need read & execute
access to /vendor/lib64.

Test: Modify hal_client_domain macro to not associate client of X HAL
      with hal_x attribute. Reboot device, no denials to do with radio
Bug: 37160141
Change-Id: Id9413275769f8b67adf2566872bee735ba035ae5

sepolicy/radio.te

@@ -24,3 +24,7 @@ userdebug_or_eng(`
 allow radio avtimer_device:chr_file rw_file_perms;
 
 allowxperm radio self:udp_socket ioctl priv_sock_ioctls;
+
+# Needed for use .so files in /vendor/lib64 needed by ims which runs as com.android.phone (radio)
+# r_dir_file(radio, vendor_file)
+allow radio vendor_file:file rx_file_perms;