ARM: mach-shmobile: ap4evb: Reserve DMA memory for the frame buffer

ap4evb board needs the same fix as
1740d34480
(ARM: mach-shmobile: mackerel: Reserve DMA memory for the frame buffer)

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/arm/mach-shmobile/board-ap4evb.c

@@ -1206,6 +1206,12 @@ static void __init ap4evb_map_io(void)
 {
 	iotable_init(ap4evb_io_desc, ARRAY_SIZE(ap4evb_io_desc));
 
+	/*
+	 * DMA memory at 0xff200000 - 0xffdfffff. The default 2MB size isn't
+	 * enough to allocate the frame buffer memory.
+	 */
+	init_consistent_dma_size(12 << 20);
+
 	/* setup early devices and console here as well */
 	sh7372_add_early_devices();
 	shmobile_setup_console();