[coreboot] [PATCH] flashrom: Add SB700 support

[Niels Ole Salscheider]

This patch adds SB700 support to flashrom and fixes a small compilation error 
for GCC 4.3.2. The code for enabling the flash rom is the same as for SB600. 
It was tested (read, write, verify) with an ASUS M3A-H/HDMI which contains a 
Macronix MX25L8005.

Signed-off-by: Niels Ole Salscheider 
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