lvcomms-nilrt-image: Add u-boot for n310
lvcomms-nilrt-image: Add u-boot for n310

For n310, we will be creating an sdimg image type, replete with
the u-boot bootloader.

Signed-off-by: Brad Mouring <58d99a887450796456131638ba4c43b5ba95afcf@ni.com>

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