blackfin: Fix up board_type global data

This should be in arch_global_data but was dropped in the change-over.

Signed-off-by: Simon Glass <sjg@chromium.org>

arch/blackfin/include/asm/global_data.h

@@ -32,6 +32,7 @@
 
 /* Architecture-specific global data */
 struct arch_global_data {
+	unsigned long board_type;
 };
 
 #include <asm-generic/global_data.h>

arch/blackfin/lib/board.c

@@ -77,7 +77,7 @@ static void display_global_data(void)
 	bd = gd->bd;
 	printf(" gd: %p\n", gd);
 	printf(" |-flags: %lx\n", gd->flags);
-	printf(" |-board_type: %lx\n", gd->board_type);
+	printf(" |-board_type: %lx\n", gd->arch.board_type);
 	printf(" |-baudrate: %u\n", gd->baudrate);
 	printf(" |-have_console: %lx\n", gd->have_console);
 	printf(" |-ram_size: %lx\n", gd->ram_size);