spi25: ignore 0x00 as a manufacturer id in the generic match

Saying that manufacturer id 0x00 is an "unknown SPI chip"
just confuses people with external programmers without a
proper connection to a chip and makes them think flashrom
doesn't support the chip they're trying to use.
Also causes unnecessary -c requirement with a multiple-slot
(FWH/LPC and SPI) serprog device i was testing.

Corresponding to flashrom svn r1893.

Signed-off-by: Urja Rannikko <urjaman@gmail.com>
Acked-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
1 file changed