axm5500: Removing u-boot build for axm5500 emulator

Signed-off-by: Paul Butler <paul.butler@windriver.com>
core-image-large : Add telnet, nis and autofs packages

Add in core-image-large package group 3 packages and the related pathes:
- inetutils (for telnet)
- autofs
- nis

Signed-off-by: Niraj Desai <nirajvdesai@gmail.com>