ppc4xx: Remove support for PPC405CR CPUs

This patch removes support for the APM 405CR CPU.
This CPU is EOL and no board uses this chip.

Signed-off-by: Matthias Fuchs <matthias.fuchs@esd.eu>
diff --git a/include/serial.h b/include/serial.h
index f6bb2b9..d232d47 100644
--- a/include/serial.h
+++ b/include/serial.h
@@ -26,7 +26,7 @@
 extern struct serial_device serial_scc_device;
 extern struct serial_device *default_serial_console(void);
 
-#if	defined(CONFIG_405GP) || defined(CONFIG_405CR) || \
+#if	defined(CONFIG_405GP) || \
 	defined(CONFIG_405EP) || defined(CONFIG_405EZ) || \
 	defined(CONFIG_405EX) || defined(CONFIG_440) || \
 	defined(CONFIG_MB86R0x) || defined(CONFIG_MPC5xxx) || \