include/fastboot.h: add missing types.h include

Fixes a compile error when building with only the TCP fastboot
implementation.

Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
Reviewed-by: Sam Protsenko <semen.protsenko@linaro.org>
Reviewed-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Link: https://lore.kernel.org/r/20240621015135.1570605-1-caleb.connolly@linaro.org


[mkorpershoek: wrapped commit msg to fix checkpatch]
Signed-off-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>