Move most *_kern.c files in arch/um/kernel to *.c.  This makes UML somewhat
more closely resemble the other arches.

[akpm@osdl.org: use the new INTF_* flags]
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>