Add board enable for Bcom WinNET P680

This patch replaces Alex Mauer's previous patch for this board (from 2008).
Tested to read, erase, and write on 2 different boards, both with AMIC
A29040BL flash chips, using both stock BIOS and coreboot images.

This patch marks the AMIC chip as tested at the same time.

Corresponding to flashrom svn r1733.

Signed-off-by: Corey Osgood <corey.osgood@gmail.com>
Acked-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
diff --git a/flashchips.c b/flashchips.c
index 5cf4aa4..83855fc 100644
--- a/flashchips.c
+++ b/flashchips.c
@@ -1355,7 +1355,7 @@
 		.total_size	= 512,
 		.page_size	= 64 * 1024,
 		.feature_bits	= FEATURE_ADDR_2AA | FEATURE_SHORT_RESET,
-		.tested		= TEST_UNTESTED,
+		.tested		= TEST_OK_PREW,
 		.probe		= probe_jedec,
 		.probe_timing	= TIMING_ZERO,
 		.block_erasers	=