Give ueventd permissions to read /proc/bootconfig

It needs to read parameters that have been moved from /proc/cmdline
to /proc/bootconfig

Test: boot Cuttlefish with 5.10 and 4.19 kernels
Bug: 173815685
Change-Id: I437b76634b7c8e779e32b68cd3043d02f4228be5
diff --git a/public/ueventd.te b/public/ueventd.te
index 9c2575a..d5d4301 100644
--- a/public/ueventd.te
+++ b/public/ueventd.te
@@ -40,8 +40,9 @@
 # Use setfscreatecon() to label /dev directories and files.
 allow ueventd self:process setfscreate;
 
-# Allow ueventd to read androidboot.android_dt_dir from kernel cmdline.
+# Allow ueventd to read androidboot.android_dt_dir from kernel cmdline or bootconfig.
 allow ueventd proc_cmdline:file r_file_perms;
+allow ueventd proc_bootconfig:file r_file_perms;
 
 # Everything is labeled as rootfs in recovery mode. ueventd has to execute
 # the dynamic linker and shared libraries.