main/flashrom: enable support for FTDI-based programmers
Add 'libftdi1-dev' to makedepends in order to enable support for FTDI-based USB SPI flash programmers. Meson finds the library automatically.
Tested with an 'UM232H-B' module using the following command: flashrom -p ft2232_spi:type=232H
Signed-off-by: Jan Samek samekh@email.cz