[Armbian build PR] - rock-3a:add u-boot image for sata boot on m.2 e.key

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Description

add patch which add to vendor u-boot support for sata boot from m.2 e-key(switch m.2 to sata and extra sata defconfig) added additional u-boot target too build the additional u-boot image with these changes the patch can be removed if this pull request for vendor u-boot for rock-3a is accepted https://github.com/radxa/u-boot/pull/95

Documentation summary for feature / change

rock-3a:add u-boot image for sata boot on m.2 e.key

• for sata boot the rkspi_loader_sata.img has to be flashed on spi flash (use dd or flashcp)

• flash armbian image to sata device with dd (or ifd3f/caligula , etcher cli )

• mount armbian boot partition on sata device and add rock-3a-sata too useroverlay

• poweroff and remove sdcard( or emmc ) to boot from sata

  armbian install doesnt work because u-boot needs extra vfat boot partition which armbian install doesnt create only single partition

How Has This Been Tested?

compiled with github ci https://github.com/pykpkg47/armbian-image-build/actions/runs/10874313933/job/30171463631 compile log https://paste.armbian.com/fasuhomeri artifacts : https://github.com/pykpkg47/armbian-image-build/releases/tag/24.8.3

tested on rock-3a u-boots detects sata ssd connected via adapter to m.2 e-key and boots kernel from it

Checklist:

• [x ] My code follows the style guidelines of this project
• [x ] I have performed a self-review of my own code
• [ x] My changes generate no new warnings

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