[flashrom] Support for ASRock 890GX Extreme3 mainboard

[Svetoslav Trochev]

Hi Stefan,

Yes, I can confirm that flashrom v0.9.5.2 works. I successfully tested
all operations: Read, Erase and Write.
I used OEM flash image version 3.10 from ASRock's website. Filename:
'890GXE3.10'. The flash chip was W25Q080BV.

Thanks,
Svetoslav Trochev.

P.S. I am not attaching output logs, but I have them and if there is
an interest I can send them at any time.