Mark com.google.face.debug as updatable-via-apex

com.google.face.debug interface is provided by the new Faceauth APEX
(com.google.android.hardware.biometrics.face).

This doesn't mean it's truly updatable individually, but means that the
interface implementation can be provided from an APEX even if it's not
updatable.

Bug: 285442265
Test: atest face_hal_p23_..._trusty_test
Change-Id: I712545ccdb82669bbb9756dc56c69193c5abeda0

device_framework_matrix_product.xml

@@ -88,7 +88,7 @@
             <instance>default</instance>
         </interface>
     </hal>
-    <hal format="aidl" optional="true">
+    <hal format="aidl" optional="true" updatable-via-apex="true">
       <name>com.google.face.debug</name>
         <version>2</version>
         <interface>