nb/intel/sandybridge: Remove stale FIXME about ECC support

Change-Id: Id0c45ff1ee4a2dc4c0f9a82f6a311f7acac156fd
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/50896
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>

src/northbridge/intel/sandybridge/raminit.c

@@ -20,7 +20,6 @@
 #include "raminit_common.h"
 #include "sandybridge.h"
 
-/* FIXME: no ECC support */
 /* FIXME: no support for 3-channel chipsets */
 
 static void wait_txt_clear(void)