In the next step endpoints for multiple interfaces are set up. Move most
of the per endpoint initialization to separate function to avoid another
identation level.
Reviewed-by: Marek Vasut <marex@denx.de>
Reviewed-by: Neal Gompa <neal@gompa.dev>
Signed-off-by: Janne Grunau <j@jannau.net>
f1820eb4f4