tegra210-minimal-initramfs: add recipe
tegra210-minimal-initramfs: add recipe

Constructs a minimal initramfs image that bundles
the xusb firmware with a minimal early init script.

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

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