image_types_tegra.bbclass: always set LNXFILE to 'boot.img'
image_types_tegra.bbclass: always set LNXFILE to 'boot.img'

The BUP generator assumes that 'boot.img' is the contents of
the kernel (or u-boot) partition has that name, so we should
use that name to make tegraflash packages usable for BUP generation.

Signed-off-by: Matt Madison <1fa2ef4755a9226cb9a0a4840bd89b158ac71391@madison.systems>

madisongh/meta-tegra,madisongh/meta-tegra,madisongh/meta-tegra,madisongh/meta-tegra,madisongh/meta-tegra