beaglebone: use new arm bootblock infrastructure

8b685398 change config flags for cpu and mainboard
bootblock initialization.
Tested on beaglebone black.

Change-Id: Ifac4a18a2e380c3472f51aaa7cc7842b01a2553e
Signed-off-by: Alexander Couzens <lynxis@fe80.eu>
Reviewed-on: http://review.coreboot.org/7190
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@google.com>

src/mainboard/ti/beaglebone/bootblock.c

@@ -19,11 +19,11 @@
 
 #include <arch/io.h>
 #include <types.h>
+#include <bootblock_common.h>
 #include <console/uart.h>
 #include <console/console.h>
 #include <cpu/ti/am335x/pinmux.h>
 
-void bootblock_mainboard_init(void);
 void bootblock_mainboard_init(void)
 {
 	void *uart_clock_ctrl = NULL;