[KM-VM] Set arm64 KM VM kernel to the AVB signed kernel

Bug: 355389155
Test: Run lk_trusty.elf on an arm64 device with pvmfw
Change-Id: If2bb7f5e3a22e7a38b3c03e58dec3bb182ac7ae6
diff --git a/guest/trusty/security_vm/launcher/Android.bp b/guest/trusty/security_vm/launcher/Android.bp
index c90d893..de29cef 100644
--- a/guest/trusty/security_vm/launcher/Android.bp
+++ b/guest/trusty/security_vm/launcher/Android.bp
@@ -29,8 +29,7 @@
             src: ":trusty_security_vm_signed",
         },
         arm64: {
-            src: ":trusty-test-lk.elf",
-            enabled: true,
+            src: ":trusty_security_vm_signed",
         },
     },
     src: ":empty_file",