Revise apns-conf.xml of Legacy GSI from goldfish to sample

GSI includes a default apns-conf.xml. This patch align the
apns-conf.xml in Legacy GSI with the one in non-Legacy GSI.

Bug: 122238063
Test: lunch aosp_arm64_ab-userdebug; make -j and check output
Change-Id: Ia9e2e411d9f62896f75e190c72260688bed5369d