nilrt: do not build -dbg and -dev
nilrt: do not build -dbg and -dev

The -dbg and -dev subpackages for the nilrt image IPK are always empty.
Disable them to reduce clutter.

Signed-off-by: Alex Stewart <04cdb2793e4fb0120cc30d1c823099f3862701f4@ni.com>
Acked-by: Haris Okanovic <4f2c24956fa4a8756878315db434b9fed29fa615@ni.com>
Natinst-ReviewBoard-ID: 312873

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