Remove outputing boot-4.19*.img from target gki_arm64

The target gki419_arm64 outputs boot-4.19*.img now.

Bug: 218629237
Test: lunch gki_arm64-userdebug; make -j40; check the out/ folder
Change-Id: I59eb1382df367fd844a3b8ef270b666fc718f425
(cherry picked from commit 0b14b124311f1c8e30ea9d8b2174990a4cf35006)
Merged-In: I59eb1382df367fd844a3b8ef270b666fc718f425
2 files changed