spi: at91-usart: Make local functions static
Suggested-by:Radu Nicolae Pirea <pirea.radu@gmail.com> Signed-off-by:
Lee Jones <lee.jones@linaro.org>
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Suggested-by:Radu Nicolae Pirea <pirea.radu@gmail.com> Signed-off-by:
Lee Jones <lee.jones@linaro.org>