repack_bootimg: support legacy boot.img format
Currently repack_bootimg only works for boot.img/vendor_boot.img version >= 3. This change adds the support for legacy boot.img version 0~2. Bug: 176789512 Bug: 174443192 Test: atest --host mkbootimg_test Test: repack_bootimg --src_bootimg boot-debug-4.19-gz.img --dst_bootimg boot_v2.img Change-Id: Iae3505d66b56f3b3d20f3c4a9915b5ee874b6dc4
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