u-boot-tegra: update for L4T R28.2 GA release
u-boot-tegra: update for L4T R28.2 GA release

but remain on AUTOREV until testing is complete.

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

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