Solve the naming problem for vendor property

Bug: 158720266
Test: Build selinux modules successfully
Change-Id: I01a83a7828d34db982db60bbf307c81fc12c7939
diff --git a/power-libperfmgr/property_contexts b/power-libperfmgr/property_contexts
index 95d2bde..f5a0493 100644
--- a/power-libperfmgr/property_contexts
+++ b/power-libperfmgr/property_contexts
@@ -1 +1 @@
-vendor.powerhal.                               u:object_r:power_prop:s0
+vendor.powerhal.                               u:object_r:vendor_power_prop:s0