Add Wistron RPAA-82 board support

[Oleksandr Tymoshenko]

Eric wrote:
> On Mon, 2009-10-26 at 18:11 +1300, Andrew Thompson wrote:
>> On Mon, Oct 26, 2009 at 11:37:52AM +0800, Eric wrote:
>>> Hi
>>> I added my ar7161 board support last weekend.
>>> It's flash is come from Spansion.
>> This is great. Oleksandr has also just added write support which will
>> conflict/duplicate some of your changes so have a look and merge any
>> outstanding changes you have made (s25fl128 support).
>>
>> http://svn.freebsd.org/viewvc/base?view=revision&revision=198465
>>
>> cheers,
>> Andrew
> 
> At first, I have my own write support, then I saw hit commit today.
> So this patch already merged his commit.
     There are some excessive code in the patch. e.g. GEOM will take care for
use that data offset and size are sector-size aligned/multiple. So I reworked
your patch a little bit:
     http://people.freebsd.org/~gonzo/mips/mx25.diff

Could you, please, test it and let me know if it works for you.

Thanks!