Add sepolicy to allow pbcs to use SysProps

-Add custom domain for our sysprops, of the forms
  -vendor.camera.pbcs.debug.*
  -persist.vendor.camera.pbcs.debug.*
  -Example: vendor.camera.pbcs.debug.enable_lyricconfigprovider
  -This domain will be system + vendor_init writable
-Allow PBCS to read those sysprops

We should now be able to gate our features in PBCS and merge in
successfully. For local dev, we can do:

adb root && adb shell setprop <prop> 1

Bug: 280340307
Test: android.os.SystemProperties.get() works successfully in
  LyricConfigProvider for vendor.camera.pbcs.debug.* props

Change-Id: I4b151f606883c0ae32f99b5f75b70b5d4e228f1d

camera/sepolicy/property.te

@@ -1,2 +1,3 @@
 vendor_internal_prop(vendor_camera_debug_prop)
+system_vendor_config_prop(vendor_camera_pbcs_debug_prop)
 

camera/sepolicy/property_contexts

@@ -1,2 +1,4 @@
 vendor.camera.debug.       u:object_r:vendor_camera_debug_prop:s0
+persist.vendor.camera.pbcs.debug.       u:object_r:vendor_camera_pbcs_debug_prop:s0
+vendor.camera.pbcs.debug.       u:object_r:vendor_camera_pbcs_debug_prop:s0
 

camera/sepolicy/vendor_pbcs_app.te

@@ -12,3 +12,8 @@ add_service(vendor_pbcs_app, vendor_camera_binder_service);
 add_service(vendor_pbcs_app, vendor_camera_lyricconfigprovider_service);
 
 binder_call(vendor_pbcs_app, hal_camera_default);
+
+# Allow PBCS to read debug system properties of the form vendor.camera.pbcs.debug.*
+# and persist.vendor.camera.pbcs.debug.*
+get_prop(vendor_pbcs_app, vendor_camera_pbcs_debug_prop);
+