[U-Boot] ls1021aqds: add hwconfig setting to do pin mux

[Wolfgang Denk]

Dear Yuan Yao,

In message <1416973224-16794-1-git-send-email-yao.yuan at freescale.com> you wrote:
> 
> Changed in v2: 
> - Rebase to latest u-boot.
> 
> Added in v1: 
> - Add hwconfig setting to do pin mux. 

Please include such change log in the comment section (below the "---"
line) of the patch itself, so it gets recorded with the patch in
patchwork.  If you post it separately like here, any reviewer of the
patchwork entry cannot find this information.

Thanks.

Best regards,

Wolfgang Denk

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