Update ShannonIms CERTIFICATE to PRESIGNED for Lynx am: 7f719af997

Original change: https://googleplex-android-review.googlesource.com/c/device/google/lynx/+/25398304

Change-Id: Ibd00d31bff6f1778fc3eca25ab22ea173d9aba89
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>

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