add support for serial lbp16 communication with 7i90

Signed-off-by: Michael Geszkiewicz <micges@wp.pl>
fixes after rebase on master

Signed-off-by: Michael Geszkiewicz <micges@wp.pl>
libanyio: update support for board 7i90HD

Signed-off-by: Michael Geszkiewicz <micges@wp.pl>
add --serial option to usage screen

Signed-off-by: Michael Geszkiewicz <micges@wp.pl>
fix few typos

Signed-off-by: Michael Geszkiewicz <micges@wp.pl>