Binary blob came from linaro:
- https://releases.linaro.org/96boards/rb5/linaro/rescue/23.12

Source code is from:
- aosp:
  * https://git.codelinaro.org/linaro/qcomlt/abl/-/commits/release/LU.UM.1.2.1.r1-23200-QRB5165.0-v4-header
  * https://git.codelinaro.org/linaro/qcomlt/abl/-/tree/07ac4ad
- linux:
  * https://git.codelinaro.org/linaro/qcomlt/abl/-/commits/release/LU.UM.1.2.1.r1-23200-QRB5165.0
  * https://git.codelinaro.org/linaro/qcomlt/abl/-/tree/70c4151

But it needs closed-source signing tool [1] from qcom to sign
the binary, so we have to treat it as firmware file.

[1] https://discuss.96boards.org/t/how-to-get-and-customize-the-bootloader/11128
