mtd: fix CONFIG_MTD_COMPLEX_MAPPINGS=n compile

[Artem Bityutskiy]

On Thu, 2010-12-16 at 20:27 -0800, Jason Lunz wrote:
> On Thu, Dec 16, 2010 at 11:01:10PM +0100, Anatolij Gustschin wrote:
> > This change breaks compiling when CONFIG_MTD_COMPLEX_MAPPINGS is not
> > defined in the kernel configuration. Please fix!
> 
> Sorry, sloppy of me. This reverts all changes to mtd.h while keeping the
> ability to compile mtd on ARCH=um, with the exception mtdchar.

Merged with the previous patch, thanks.

-- 
Best Regards,
Artem Bityutskiy (Битюцкий Артём)