Alexander von Gluck IV 1aab1c0e28 u-boot: cleanups on arm, load from more media
* Attempt to find haiku loader on mmc,nvme,virtio
* Fixes automatic boot under u-boot on qemu
* Remove boot.scr to ensure it's regenerated each build
* Remove obsolete HAIKU_BOARD_SDIMAGE_UBOOT_UENV

Change-Id: I60cd518ec69e408ddbd7ea17371f4f4f56fa7f7b
2020-01-20 16:26:37 -06:00
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