Fix grouper build by allowing mknod in recovery

Change-Id: I2aef01ba72cae028d5e05deddbdeff674f9a534d
diff --git a/domain.te b/domain.te
index a1a782b..eda9091 100644
--- a/domain.te
+++ b/domain.te
@@ -193,6 +193,7 @@
   -init
   -ueventd
   -vold
+  -recovery
 } self:capability mknod;
 
 # Limit raw I/O to these whitelisted domains.