kernel: fix kernel targets for arm64

Use correct kernel targets for arm64 to be able append DTB to kernel
bin at the end.
Image.gz and Image.gz-dtb targets are used depending on TARGET_KERNEL_DTB.

BUG: 27674989

Change-Id: Ie68338e44fe7e80c0de0ac5bf3533d677182361a
Signed-off-by: Dzmitry Yatsushkevich <dmitryya@nestlabs.com>
1 file changed