MIPS: BCM63xx: Remove duplicated #include

Remove duplicated #include in arch/mips/bcm63xx/boards/board_bcm963xx.c.
Signed-off-by: NHuang Weiyi <weiyi.huang@gmail.com>
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

arch/mips/bcm63xx/boards/board_bcm963xx.c

@@ -20,7 +20,6 @@
 #include <bcm63xx_cpu.h>
 #include <bcm63xx_regs.h>
 #include <bcm63xx_io.h>
-#include <bcm63xx_board.h>
 #include <bcm63xx_dev_pci.h>
 #include <bcm63xx_dev_enet.h>
 #include <bcm63xx_dev_dsp.h>