The main transfer function for cros_ec_spi can be called by more than
one client at a time. Make sure that those clients don't stomp on
each other by locking the bus for the duration of the transfer
function.
Signed-off-by: Doug Anderson <dianders@chromium.org> Reviewed-by: Simon Glass <sjg@chromium.org> Tested-by: Andrew Bresticker <abrestic@chromium.org> Tested-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Lee Jones <lee.jones@linaro.org>