powerpc: remove 4xx support

There was for long time no activity in the 4xx area.
We need to go further and convert to Kconfig, but it
turned out, nobody is interested anymore in 4xx,
so remove it.

Signed-off-by: Heiko Schocher <hs@denx.de>
diff --git a/arch/powerpc/include/asm/ppc.h b/arch/powerpc/include/asm/ppc.h
index 4d9af6c..aa6c304 100644
--- a/arch/powerpc/include/asm/ppc.h
+++ b/arch/powerpc/include/asm/ppc.h
@@ -25,9 +25,6 @@
 #include <mpc83xx.h>
 #include <asm/immap_83xx.h>
 #endif
-#ifdef	CONFIG_4xx
-#include <asm/ppc4xx.h>
-#endif
 #ifdef CONFIG_SOC_DA8XX
 #include <asm/arch/hardware.h>
 #endif
@@ -47,8 +44,7 @@
 void wr_dc_cst(uint);
 void wr_dc_adr(uint);
 
-#if defined(CONFIG_4xx)	|| \
-	defined(CONFIG_MPC85xx)	|| \
+#if defined(CONFIG_MPC85xx)	|| \
 	defined(CONFIG_MPC86xx)	|| \
 	defined(CONFIG_MPC83xx)
 unsigned char	in8(unsigned int);