Move ip2.c and ip2main.c to drivers/char/ip2/ where the other files

used by this driver reside.

Renamed ip2.c to ip2base.c to allow ip2.o to be built from multiple
objects.

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Acked-by: Michael H. Warfield <mhw@WittsEnd.com>