[Bug]: Armbian skips rebuild updated U-boot and keeps cached

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      1. What happened?

I'm using custom board config that has a similar as rock-5b.conf U-boot post config

```

1. Mainline u-boot or Kwiboo's tree
   function post_family_config_branch_edge__rock-5b_use_mainline_uboot() {
   display_alert "$BOARD" "mainline (next branch) u-boot overrides for $BOARD / $BRANCH" "info"

declare -g BOOTCONFIG="rock5b-rk3588_defconfig" # override the default for the board/family

declare -g BOOTDELAY=1 # Wait for UART interrupt to enter UMS/RockUSB mode etc
declare -g BOOTSOURCE="https://github.com/Kwiboo/u-boot-rockchip.git" # We ❤️ Kwiboo's tree
declare -g BOOTBRANCH="branch:rk3xxx-2024.04" # commit:31522fe7b3c7733313e1c5eb4e340487f6000196 as of 2024-04-01
declare -g BOOTPATCHDIR="v2024.04-rock5b-radxa" # empty; defconfig changes are done in hook below
declare g BOOTDIR="u-boot${BOARD}" # do not share u-boot directory
declare -g UBOOT_TARGET_MAP="BL31=${RKBIN_DIR}/${BL31_BLOB} ROCKCHIP_TPL=${RKBIN_DIR}/${DDR_BLOB};;u-boot-rockchip.bin u-boot-rockchip-spi.bin"
unset uboot_custom_postprocess write_uboot_platform write_uboot_platform_mtd # disable stuff from rockchip64_common; we're using binman here which does all the work already

1. Just use the binman-provided u-boot-rockchip.bin, which is ready-to-go
   function write_uboot_platform() {
   dd "if=$1/u-boot-rockchip.bin" "of=$2" bs=32k seek=1 conv=notrunc status=none
   }

function write_uboot_platform_mtd() {

flashcp -v -p "$1/u-boot-rockchip-spi.bin" /dev/mtd0
}
}
```

If I push new commits into branch - Armbian just skips U-boot build and use cached version.

```
[🐳|🌱] Using cached pip packages for Python tools [ a61a78b41c898744fbc2d1d13d6a127df20406336cbe64af66bf1e075570b93e ]
[🐳|🔨] Summary: Aggregation: debootstrap: 5; rootfs: 45; image: 3; desktop: 0; apt-sources: 0; hash: 4a7eeaed1446ffd6
[🐳|🌱] artifact [ uboot :: uboot() ]
[🐳|🌱] Using cached [ GIT_INFO_UBOOT ]
[🐳|🌱] Reversioning package [ re-version 'uboot-customer-abc-vendor(deb)::2024.10-rc6-Sabb5-P0000-H272d-Vc176-Bb703-R448a' to '25.02.0-trunk' ]
```

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   1.  

      1. How to reproduce?

Push new commits into `BOOTBRANCH` and recompile image. Result - old U-boot in output image.

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      1. Branch

main (main development branch)

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   1.  

      1. On which host OS are you running the build script and observing this problem?

Ubuntu 24.04 Noble

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   1.  

      1. Are you building on Windows WSL2?

• [ ] Yes, my Ubuntu/Debian/OtherOS is running on WSL2

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      1. Relevant log URL

No response

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      1. Code of Conduct

• [x] I agree to follow this project's Code of Conduct

Raised by: https://github.com/bmx666

https://github.com/armbian/build/issues/7710