net/atm/mpc.c: checkpatch cleanups

Convert #include <asm... to #include <linux...
Add printk argument verification to dprintk and ddprintk
Spacing cleanups
Mostly 80 column wrapped.
printk->pr_info and pr_cont
Moved labels to column 1
Move trailing statements to new lines
switch/case cleanups
	remove unnecessary breaks after returns
Remove unnecessary braces around single line statements

Signed-off-by: Joe Perches <[email protected]>
Signed-off-by: David S. Miller <[email protected]>