Update ShannonIms CERTIFICATE to PRESIGNED for Lynx

Bug: 311289519
Change-Id: I75460e4a840bb319b6a00442fde3f14f52f574d0

self-extractors/google_devices/staging/Android.mk

@@ -48,7 +48,7 @@ LOCAL_PRIVILEGED_MODULE := true
 LOCAL_MODULE_OWNER := samsung
 LOCAL_MODULE_CLASS := APPS
 LOCAL_SRC_FILES := $(LOCAL_MODULE).apk
-LOCAL_CERTIFICATE := platform
+LOCAL_CERTIFICATE := PRESIGNED
 LOCAL_LICENSE_KINDS := SPDX-license-identifier-Apache-2.0
 LOCAL_LICENSE_CONDITIONS := notice
 LOCAL_NOTICE_FILE := $(LOCAL_PATH)/../COPYRIGHT $(LOCAL_PATH)/../LICENSE