add missing PCS3 for MCF5445x

This patch adds the code for handling PCS3 (DSPI chip select 3) in
cpu_init.c and m5445x.h

Signed-off-by: Wolfgang Wegner <w.wegner at astro-kom.de>
diff --git a/arch/m68k/include/asm/m5445x.h b/arch/m68k/include/asm/m5445x.h
index dfddde6..c575b8f 100644
--- a/arch/m68k/include/asm/m5445x.h
+++ b/arch/m68k/include/asm/m5445x.h
@@ -314,6 +314,7 @@
 #define GPIO_PAR_DMA_DREQ1_GPIO		(0x00)
 #define GPIO_PAR_DMA_DACK0_UNMASK	(0xF3)
 #define GPIO_PAR_DMA_DACK0_DACK1	(0x0C)
+#define GPIO_PAR_DMA_DACK0_PCS3		(0x08)
 #define GPIO_PAR_DMA_DACK0_ULPI_DIR	(0x04)
 #define GPIO_PAR_DMA_DACK0_GPIO		(0x00)
 #define GPIO_PAR_DMA_DREQ0_DREQ0	(0x01)