[yocto] Minor tweak required for beagleboard-edison

[Lorenzati, Marcelo]

I tested the prebuild package for beagleboard (beagleboard-edison) and I found a minor concern to let it work on newer models of the board (beagleboard xm).
The new model's u-boot looks for a uEnv.txt to boot, so it's necessary to create a file to jump to the boot.scr script.

uEnv.tx:
bootenv=boot.scr
loaduimage=fatload mmc ${mmcdev} ${loadaddr} ${bootenv}
mmcboot=echo jumping to boot.scr script from mmc ...; source ${loadaddr}

If the u-boot is an older model, this script does no harm as its not invoked.

Regards,

Marcelo Lorenzati
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