Update ShannonIms CERTIFICATE to PRESIGNED for Lynx am: 46c7dfa0c9

Original change: https://googleplex-android-review.googlesource.com/c/device/google/lynx/+/25867468

Change-Id: Ic0e72484374e19a409774eefbc21e2ca521fa878
Signed-off-by: Automerger Merge Worker <[email protected]>

self-extractors/google_devices/staging/Android.mk.template

@@ -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