modem_diagnostics: add rules for getting battery info am: 86b2d1c4da

Original change: https://android-review.googlesource.com/c/device/google/sunfish-sepolicy/+/1881114

Change-Id: If3bce02d511700820ce10017c10aed8226706a9d
diff --git a/vendor/google/modem_diagnostics.te b/vendor/google/modem_diagnostics.te
index 6783d1e..a01d3af 100644
--- a/vendor/google/modem_diagnostics.te
+++ b/vendor/google/modem_diagnostics.te
@@ -18,4 +18,7 @@
 
   set_prop(modem_diagnostic_app, vendor_modem_diag_prop)
   set_prop(modem_diagnostic_app, radio_control_prop)
+
+  allow modem_diagnostic_app sysfs_batteryinfo:file r_file_perms;
+  allow modem_diagnostic_app sysfs_batteryinfo:dir search;
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