linux-imx

um: fix up obsolete cpu function usage.

Thanks to spatch.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: Jeff Dike <jdike@addtoit.com>
Cc: Richard Weinberger <richard@nod.at>
Cc: user-mode-linux-devel@lists.sourceforge.net