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For SPI, we can get up to 32 additional bytes for response preamble. The current overhead (2 bytes) may cause problems when we try to receive a big response. Update it to 32 bytes. Without this fix we could see a kernel BUG when we receive a big response from the Chrome EC when is connected via SPI. Signed-off-by: Vic Yang <victoryang@google.com> Tested-by: Enric Balletbo i Serra <enric.balletbo.collabora.com> Signed-off-by: Lee Jones <lee.jones@linaro.org>