[U-Boot] arm: stm32: Remove redundant thumb build selection

[Tom Rini]

On Fri, Aug 31, 2018 at 04:15:14PM -0700, Vikas Manocha wrote:

> All armv7m arch builds are thumb & SYS_THUMB_BUILD is already selected by
> CPU_ARMV7M.
> 
> Signed-off-by: Vikas Manocha <vikas.manocha at st.com>

Applied to u-boot/master, thanks!

-- 
Tom
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