powerpc: mpc8xx: remove redundant CONFIG_8xx definition

We do not have to define CONFIG_8xx in source files
because it is defined in arch/powerpc/cpu/mpc8xx/config.mk
Signed-off-by: NMasahiro Yamada <yamada.m@jp.panasonic.com>

arch/powerpc/cpu/mpc8xx/kgdb.S

@@ -9,8 +9,6 @@
 #include <mpc8xx.h>
 #include <version.h>
 
-#define CONFIG_8xx 1		/* needed for Linux kernel header files */
-
 #include <ppc_asm.tmpl>
 #include <ppc_defs.h>
 

arch/powerpc/cpu/mpc8xx/start.S

@@ -26,8 +26,6 @@
 #include <mpc8xx.h>
 #include <version.h>
 
-#define CONFIG_8xx 1		/* needed for Linux kernel header files */
-
 #include <ppc_asm.tmpl>
 #include <ppc_defs.h>