Allow CompOS to read VM config properties

We want to allow both the VM and ART to contribute to the VM config
(e.g. memory size), so define labels for 2 sets of properties and
grant the necessary access.

Bug: 274102209
Test: builds
Change-Id: Iaca1e0704301c9155f44e1859fc5a36198917568
diff --git a/private/property_contexts b/private/property_contexts
index 269442d..03b82bd 100644
--- a/private/property_contexts
+++ b/private/property_contexts
@@ -1479,6 +1479,10 @@
 # virtualization service properties
 virtualizationservice.state.last_cid u:object_r:virtualizationservice_prop:s0 exact uint
 
+# composd properties
+composd.vm.art.memory_mib.config u:object_r:composd_vm_art_prop:s0 exact uint
+composd.vm.vendor.memory_mib.config u:object_r:composd_vm_vendor_prop:s0 exact int
+
 # properties for the virtual Face HAL
 persist.vendor.face.virtual.type u:object_r:virtual_face_hal_prop:s0 exact string
 persist.vendor.face.virtual.strength u:object_r:virtual_face_hal_prop:s0 exact string