[PATCH] arm: Enable SYS_THUMB_BUILD on AT91

[Tom Rini]

On Sat, Nov 04, 2023 at 10:27:42PM -0400, Sean Anderson wrote:

> Several AT91 boards are quite close to their SPL size limit. For example,
> sama5d27_wlsom1_ek_mmc is just 173 bytes short of its limit and doesn't
> even fit with older GCCs.
> 
> All AT91 processors should have thumb support. Enable SYS_THUMB_BUILD. This
> shrinks SPL by around 30%.
> 
> Signed-off-by: Sean Anderson <seanga2 at gmail.com>
> ---
> This has been BUILD TESTED ONLY!

We in turn need this for Sean's other cleanup series to go in. Is this
OK? Would it be safer if it was only for CPU_V7A ? I do have
recollections of thumb being sometimes buggy prior to v7a cores. Thanks!

-- 
Tom
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