ft2232_spi: clarify the comment about gpio configuration

The comment explaining gpio levels might be easily misunderstood when
the reader misses the word `output`. Add an explicit description of
handling of the GPIOL* pins to avoid that and make things even more
clear.

Change-Id: Iaceec889a65ead8cdde917f61b2a9695d440f781
Signed-off-by: Michael Niewöhner <foss@mniewoehner.de>
Original-Reviewed-on: https://review.coreboot.org/c/flashrom/+/57808
Original-Reviewed-by: Nico Huber <nico.h@gmx.de>
1 file changed