mpc83xx: immap_83xx: add spi8xxx_t in immap for mpc8309

Allow drivers/spi/mpc8xxx_spi.c to be built for an mpc8309 target.

Signed-off-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk>
Reviewed-by: Mario Six <mario.six@gdsys.cc>
diff --git a/arch/powerpc/include/asm/immap_83xx.h b/arch/powerpc/include/asm/immap_83xx.h
index d02da64..609869c 100644
--- a/arch/powerpc/include/asm/immap_83xx.h
+++ b/arch/powerpc/include/asm/immap_83xx.h
@@ -941,8 +941,7 @@
 	u8			res4[0x500];
 	fsl_lbc_t		im_lbc;		/* Local Bus Controller Regs */
 	u8			res5[0x1000];
-	u8			spi[0x100];
-	u8			res6[0xf00];
+	spi8xxx_t		spi;		/* Serial Peripheral Interface */
 	dma83xx_t		dma;		/* DMA */
 	pciconf83xx_t		pci_conf[1];	/* PCI Configuration Registers */
 	u8			res7[0x80];