pkggrp-ni-extra: remove umip
pkggrp-ni-extra: remove umip

umip no longer has an upstream provided recipe. Remove it, in absence of
a discrete requirement.

Signed-off-by: Alex Stewart <04cdb2793e4fb0120cc30d1c823099f3862701f4@ni.com>

ni/meta-nilrt,ni/meta-nilrt,ni/meta-nilrt,ni/meta-nilrt,ni/meta-nilrt