[U-Boot] [PATCH v4 4/6] armv7: Use -march=armv7-a and thereby enable Thumb-2

[Marek Vasut]

Dear Aneesh V,

> Enable -march=armv7-a for armv7 platforms if the tool-chain
> supports it. This in turn results in Thumb-2 code generated
> for these platforms if CONFIG_SYS_THUMB_BUILD is enabled.
> 
> Signed-off-by: Aneesh V <aneesh at ti.com>
> ---

For some reason, this patch breaks USB EHCI on mx51 efika boards. The board just 
freezes instead of detecting USB devices. Reverting this patch fixes the issue.

Note I use gcc 4.7.1 (!), might be compiler issue?

Tom, can you try on one of your beagle-dogs please? :)

Best regards,
Marek Vasut