Add SELinux Policy for RILD to access FSG partition

Cherry-pick of commit 61191ea97e3d2172fe853061ba093d54b55ad95a

QCRIL has to access FSG partition which contains the MCFG MBN files
for downloading to modem.

Bug: 18487207

Change-Id: I628653a9f1593151efe5db39832cadf7d77a5475
diff --git a/sepolicy/rild.te b/sepolicy/rild.te
index 222013c..69069ae 100644
--- a/sepolicy/rild.te
+++ b/sepolicy/rild.te
@@ -22,3 +22,7 @@
 r_dir_file(rild, netmgrd)
 # b/18352920 suppress denials until the procfs lookup is removed
 dontaudit rild domain:dir r_dir_perms;
+
+# Allow permissions for FSG
+allow rild fsg_file:dir search;
+allow rild fsg_file:file r_file_perms;