Quick fix for 82802ac

Corresponding to coreboot v1 svn r736.
diff --git a/flash_rom.c b/flash_rom.c
index 84c7661..a4f8ca5 100644
--- a/flash_rom.c
+++ b/flash_rom.c
@@ -63,6 +63,8 @@
      probe_m29f400bt,   erase_m29f400bt,   write_linuxbios_m29f400bt},
     {"82802ab",   137, 173 ,    NULL, 512, 64*1024,
      probe_82802ab,   erase_82802ab,   write_82802ab},
+    {"82802ac",   137, 172 ,    NULL, 1024, 64*1024,
+     probe_82802ab,   erase_82802ab,   write_82802ab},
     {NULL,}
 };