tiny-printf: Support sprintf()
Add a simple version of this function for SPL. It does not check the buffer size as this would add to the code size. Signed-off-by: NMarek Vasut <marex@denx.de> Cc: Simon Glass <sjg@chromium.org> Cc: Stefan Roese <sr@denx.de> Cc: Tom Rini <trini@konsulko.com> Cc: lesne@alse-fr.com Reviewed-by: NTom Rini <trini@konsulko.com> Reviewed-by: NSylvain Lesne <lesne@alse-fr.com> Tested-by: NSylvain Lesne <lesne@alse-fr.com>
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