modem_diagnostics: add rules for getting battery info

Original change: https://android-review.googlesource.com/c/device/google/bonito-sepolicy/+/1880670

Bug: 204961005

Merged-In: I0f8e02ba592f6a5048575d8aad6024ecacb70b2c
Change-Id: I0f8e02ba592f6a5048575d8aad6024ecacb70b2c
(cherry picked from commit 6c7f6b054d208a6637513ad6c44ac9b797ef3bb4)
diff --git a/vendor/google/modem_diagnostics.te b/vendor/google/modem_diagnostics.te
index d506496..1805ac1 100644
--- a/vendor/google/modem_diagnostics.te
+++ b/vendor/google/modem_diagnostics.te
@@ -20,4 +20,7 @@
 
   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;
 ')