ppc4xx: Replace 4xx lowercase SPR references

Signed-off-by: Matthias Fuchs <matthias.fuchs@esd.eu>
Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/cpu/ppc4xx/cpu_init.c b/cpu/ppc4xx/cpu_init.c
index bbd795d..65092fb 100644
--- a/cpu/ppc4xx/cpu_init.c
+++ b/cpu/ppc4xx/cpu_init.c
@@ -123,7 +123,7 @@
 	/* Reset processor if configuration changed */
 	if (reset_needed) {
 		__asm__ __volatile__ ("sync; isync");
-		mtspr(dbcr0, 0x20000000);
+		mtspr(SPRN_DBCR0, 0x20000000);
 	}
 #endif
 }