Move the i386 __delay to sys-i386 and add an implementation for x86_64.
Also get rid of the definition of um_udelay_t.
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>