powerpc/km: drop unused CONFIG_SYS_DTT_LOW_TEMP

This define is not used in u-boot code, we can drop this define safely.

Signed-off-by: Holger Brunck <holger.brunck@keymile.com>

include/configs/km/km83xx-common.h

@@ -223,7 +223,6 @@
 #define CONFIG_DTT_LM75		/* ON Semi's LM75 */
 #define CONFIG_DTT_SENSORS	{0, 1, 2, 3}	/* Sensor addresses */
 #define CONFIG_SYS_DTT_MAX_TEMP	70
-#define CONFIG_SYS_DTT_LOW_TEMP	-30
 #define CONFIG_SYS_DTT_HYSTERESIS	3
 #define CONFIG_SYS_DTT_BUS_NUM		1
 

include/configs/km82xx.h

@@ -271,7 +271,6 @@ int get_scl(void);
 #define CONFIG_DTT_LM75			/* ON Semi's LM75		*/
 #define CONFIG_DTT_SENSORS	{0}	/* Sensor addresses		*/
 #define CONFIG_SYS_DTT_MAX_TEMP	70
-#define CONFIG_SYS_DTT_LOW_TEMP	-30
 #define CONFIG_SYS_DTT_HYSTERESIS	3
 #define CONFIG_SYS_DTT_BUS_NUM		2