[ppc] Fix build breakage for all non-4xx PowerPC variants.

- adapt to the more generic EXCEPTION_PROLOG and CRIT_EXCEPTION macros
- minor 4xx cleanup
diff --git a/include/mpc8xx.h b/include/mpc8xx.h
index 2911758..1130598 100644
--- a/include/mpc8xx.h
+++ b/include/mpc8xx.h
@@ -35,7 +35,7 @@
  * Exception offsets (PowerPC standard)
  */
 #define EXC_OFF_SYS_RESET	0x0100	/* System reset				*/
-
+#define _START_OFFSET		EXC_OFF_SYS_RESET
 
 /*-----------------------------------------------------------------------
  * SYPCR - System Protection Control Register				11-9