[flashrom] Support using FTD2XX driver for FT2232H device

[Steffen Mauch]

Hello,

right now, I am working on a windows version of Flashrom based on the FTD2XX driver from FTDI instead of libFTDI.
Thus, I would like to know if I should submit a patch such that the ‚ft2232_spi.c‘ can cope with libFTDI and FTD2XX via defines or crate a new driver.

Best regards
Steffen