Revert^2 "Add qemu.hw.mainkeys to system property_contexts"

509b35e5d9b72f725d17fab35ecb11b9b706a399

Bug: 180412668
Merged-In: I4067bba36613fa41e3c7a085da76cda4784753ad
Change-Id: I4067bba36613fa41e3c7a085da76cda4784753ad
diff --git a/private/property_contexts b/private/property_contexts
index 7d99a24..42efcff 100644
--- a/private/property_contexts
+++ b/private/property_contexts
@@ -186,6 +186,9 @@
 dalvik.                 u:object_r:dalvik_prop:s0
 ro.dalvik.              u:object_r:dalvik_prop:s0
 
+# qemu_hw_prop is read/written by both system and vendor.
+qemu.hw.mainkeys        u:object_r:qemu_hw_prop:s0
+
 # Shared between system server and wificond
 wifi.                   u:object_r:wifi_prop:s0
 wlan.                   u:object_r:wifi_prop:s0