drivers/spi: remove SPI_FLASH_FAST_READ_DUAL_OUTPUT_3B option
The SPI_FLASH_FAST_READ_DUAL_OUTPUT_3B option is no longer
being used in the code. There's a runtime check for supporting
fast read dual output mode of the spi flash. Remove the references
to SPI_FLASH_FAST_READ_DUAL_OUTPUT_3B.
Change-Id: Ie7d9d3f91f29a700f07ab33feaf427a872bbf7df
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/38166
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>