misctrl: add a property

misctrl can set properties which can be injected into
bugreports.

Limit visibility of these properties so that no device
code can branch based off these properties.

Bug: 317262681
Test: bugreport
Change-Id: I74f6f240b08b2681540bca262dcc76bcdca9cdad
diff --git a/private/dumpstate.te b/private/dumpstate.te
index 6798667..29cd454 100644
--- a/private/dumpstate.te
+++ b/private/dumpstate.te
@@ -68,6 +68,8 @@
 # Collect metrics on boot time created by init
 get_prop(dumpstate, boottime_prop)
 
+get_prop(dumpstate, misctrl_prop)
+
 # Signal native processes to dump their stack.
 allow dumpstate {
   mediatranscoding