[NFC] Move MTE mode settings to a product variable.

The default list of memtag targets found in
  build/make/target/product/memtag-common.mk

Bug: 280343521
Test: no functional change
Change-Id: Ia713937269b94c92656f8c7f821c4e8d744c2d99
diff --git a/Android.bp b/Android.bp
index f6c4960..9efa325 100644
--- a/Android.bp
+++ b/Android.bp
@@ -48,7 +48,4 @@
         "-Werror",
     ],
     init_rc: ["mtpd.rc"],
-    sanitize: {
-        memtag_heap: true,
-    },
 }