[brcm63xx] fix bisectability of patch 303-spi-board-info.patch

It uses spi_register_board_info() from linux/spi/spi.h but does not include it
explicitely.

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@32058 3c298f89-4303-0410-b956-a3cf2f4a3e73

target/linux/brcm63xx/patches-3.3/303-spi-board-info.patch

 --- a/arch/mips/bcm63xx/boards/board_bcm963xx.c
 +++ b/arch/mips/bcm63xx/boards/board_bcm963xx.c
-@@ -933,6 +933,9 @@ int __init board_register_devices(void)
+@@ -17,6 +17,7 @@
+ #include <linux/ssb/ssb.h>
+ #include <linux/gpio_keys.h>
+ #include <linux/input.h>
++#include <linux/spi/spi.h>
+ #include <asm/addrspace.h>
+ #include <bcm63xx_board.h>
+ #include <bcm63xx_cpu.h>
+@@ -933,6 +934,9 @@ int __init board_register_devices(void)
  	if (board.num_devs)
  		platform_add_devices(board.devs, board.num_devs);