[PATCH] Char: moxa, variables cleanup

- rename moxaChannels to moxa_port
- rename moxa_str to moxa_ports
- move board global variables into moxa_board
- move port global variables into moxa_port

Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>