Remove special case handling of "ro." properties

Currently, properties that begin with "ro." are special cased to skip
over the "ro." part of the prefix before matching with entries in
property_contexts.  A change to init is removing this special case and
therefore, the "ro." prefixes must be explicitly added to
property_contexts.

Bug 26425619

Change-Id: I735eb9fc208eeec284cda8d778db946eeec24192
diff --git a/target/board/generic/sepolicy/property_contexts b/target/board/generic/sepolicy/property_contexts
index 152f0c8..142b062 100644
--- a/target/board/generic/sepolicy/property_contexts
+++ b/target/board/generic/sepolicy/property_contexts
@@ -1,5 +1,5 @@
 qemu.                   u:object_r:qemu_prop:s0
-emu.                    u:object_r:qemu_prop:s0
-emulator.               u:object_r:qemu_prop:s0
-radio.noril             u:object_r:radio_noril_prop:s0
-opengles.               u:object_r:opengles_prop:s0
+ro.emu.                 u:object_r:qemu_prop:s0
+ro.emulator.            u:object_r:qemu_prop:s0
+ro.radio.noril          u:object_r:radio_noril_prop:s0
+ro.opengles.            u:object_r:opengles_prop:s0