rpi: Only add frame buffer node if CONFIG_FDT_SIMPLEFB is set

The functions fdt_simplefb_add_node and fdt_simplefb_enable_and_mem_rsv
are only available if CONFIG_FDT_SIMPLEFB is enabled.

Signed-off-by: Martin Stolpe <martin.stolpe@gmail.com>
Acked-by: Matthias Brugger <mbrugger@suse.com>
Signed-off-by: Peter Robinson <pbrobinson@gmail.com>
diff --git a/board/raspberrypi/rpi/rpi.c b/board/raspberrypi/rpi/rpi.c
index 4d54689..fe6153b 100644
--- a/board/raspberrypi/rpi/rpi.c
+++ b/board/raspberrypi/rpi/rpi.c
@@ -604,11 +604,13 @@
 
 	update_fdt_from_fw(blob, (void *)fw_dtb_pointer);
 
-	node = fdt_node_offset_by_compatible(blob, -1, "simple-framebuffer");
-	if (node < 0)
-		fdt_simplefb_add_node(blob);
-	else
-		fdt_simplefb_enable_and_mem_rsv(blob);
+	if (CONFIG_IS_ENABLED(FDT_SIMPLEFB)) {
+		node = fdt_node_offset_by_compatible(blob, -1, "simple-framebuffer");
+		if (node < 0)
+			fdt_simplefb_add_node(blob);
+		else
+			fdt_simplefb_enable_and_mem_rsv(blob);
+	}
 
 #ifdef CONFIG_EFI_LOADER
 	/* Reserve the spin table */