When freezing framework manifests, use aosp_arm64 target

We want to use GSI targets because they will contain the expected
framework manifests in order to remain backwards compatibile.
New launching devices may choose to remove some of the services like
hwservicemanager.

Test: NA
Bug: 218588089
Change-Id: Iae4abb43a8c4a2e535ff961418fa4139506792cd
1 file changed