[PATCH] drivers/isdn/hardware/avm/: misc cleanups

This patch contains the following cleanups:
- make some needlessly global functions static
- b1dma.c __init/__exit the functions b1dma_{init,exit}

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>