ppc4xx: Define CONFIG_BOOKE for all PPC440 based processors

CONFIG_BOOKE must be defined for PPC440 processors so that the proper SPR
number is used to access system registers.

Signed-off-by: Eugene O'Brien <eugene.obrien@advantechamt.com>
Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/include/asm-ppc/processor.h b/include/asm-ppc/processor.h
index 451ee94..f58b38a 100644
--- a/include/asm-ppc/processor.h
+++ b/include/asm-ppc/processor.h
@@ -91,6 +91,11 @@
 
 /* Special Purpose Registers (SPRNs)*/
 
+/* PPC440 Architecture is BOOK-E */
+#ifdef CONFIG_440
+#define CONFIG_BOOKE
+#endif
+
 #define SPRN_CDBCR	0x3D7	/* Cache Debug Control Register */
 #define SPRN_CTR	0x009	/* Count Register */
 #define SPRN_DABR	0x3F5	/* Data Address Breakpoint Register */