Set OF_STDOUT_PATH to match the default console on MPC8568 MDS

On the MPC8568 MDS we use ttyS0, UART0, etc. as the standard configured
console.  Make it so we match that config what we tell Linux as the early
STDOUT console.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

include/configs/MPC8568MDS.h

@@ -297,7 +297,7 @@ extern unsigned long get_clock_freq(void);
 #define OF_SOC			"soc8568@e0000000"
 #define OF_QE			"qe@e0080000"
 #define OF_TBCLK		(bd->bi_busfreq / 8)
-#define OF_STDOUT_PATH		"/soc8568@e0000000/serial@4600"
+#define OF_STDOUT_PATH		"/soc8568@e0000000/serial@4500"
 
 /*
  * I2C