Allow bootctl HAL to access misc block device.

This is sometimes used for communication with the bootloader.

Bug: 62052545
Test: Build
Change-Id: I3ae37793407719e55ab0830129aa569c9018f7da
diff --git a/public/domain.te b/public/domain.te
index 8f63624..34cbadc 100644
--- a/public/domain.te
+++ b/public/domain.te
@@ -489,6 +489,7 @@
 neverallow {
   domain
   userdebug_or_eng(`-domain') # exclude debuggable builds
+  -hal_bootctl
   -init
   -uncrypt
   -update_engine