Revert "Revert "gs101: update shared_modem_platform sepolicy for..."

Revert submission 28822848-revert-28762313-SAYUORWKVG

Reason for revert: issue identify and fix is ready

Reverted changes: /q/submissionid:28822848-revert-28762313-SAYUORWKVG

Change-Id: I17fd2b246fc95eac9a5e953c7c7889ecb2c91d1d
diff --git a/whitechapel/vendor/google/modem_svc_sit.te b/whitechapel/vendor/google/modem_svc_sit.te
index 0eb7498..8e4ac3d 100644
--- a/whitechapel/vendor/google/modem_svc_sit.te
+++ b/whitechapel/vendor/google/modem_svc_sit.te
@@ -41,4 +41,10 @@
 # Allow modem_svc_sit to access modem image file/dir
 allow modem_svc_sit modem_img_file:dir r_dir_perms;
 allow modem_svc_sit modem_img_file:file r_file_perms;
-allow modem_svc_sit modem_img_file:lnk_file r_file_perms;
\ No newline at end of file
+allow modem_svc_sit modem_img_file:lnk_file r_file_perms;
+
+# Allow modem_svc_sit to access socket for UMI
+userdebug_or_eng(`
+  allow modem_svc_sit radio_vendor_data_file:sock_file { create unlink };
+')
+