digsy_mtc: Add TCR register value for RTC (DS1339)

Signed-off-by: Werner Pfister <werner.pfister@intercontrol.de>
Signed-off-by: Detlev Zundel <dzu@denx.de>

include/configs/digsy_mtc.h

@@ -244,6 +244,7 @@
  */
 #define CONFIG_RTC_DS1337
 #define CONFIG_SYS_I2C_RTC_ADDR	0x68
+#define CONFIG_SYS_DS1339_TCR_VAL	0xAB	/* diode + 4k resistor */
 
 /*
  * Flash configuration