Blackfin: disable syscontrol code for now

Looks like the initcode updates fell out of order during my merges.  The
patch that really fixes up this code is part of power-on overhaul and so
is too large for merging at this point.  Instead, we can disable the code
as no currently in-tree board depends on it.  The next merge window will
fix things up properly.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

cpu/blackfin/initcode.c

@@ -264,6 +264,7 @@ void initcode(ADI_BOOT_DATA *bootstruct)
 	 * the memory controller.  Older bootroms lacks such helpers
 	 * so we do it ourselves.
 	 */
+#define BOOTROM_CAPS_SYSCONTROL 0
 	if (BOOTROM_CAPS_SYSCONTROL) {
 		serial_putc('S');