Compile gfxnvidia by default, but disallow write/erase

Corresponding to flashrom svn r1117.

Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Uwe Hermann <uwe@hermann-uwe.de>

gfxnvidia.c

@@ -82,6 +82,9 @@ int gfxnvidia_init(void)
 
 	buses_supported = CHIP_BUSTYPE_PARALLEL;
 
+	/* Write/erase doesn't work. */
+	programmer_may_write = 0;
+
 	return 0;
 }