Add SSR support for factory kit

Following pin 57 temp and 58 relay from photos provided by Justin Kennedy. Uses built in keenovo temp sensor.

Marlin/Configuration.h

@@ -23,6 +23,7 @@
 //#define X_2208
 //#define Y_2208
 
+//#define BedAC
 /**
  * Configuration.h
  *
@@ -312,7 +313,11 @@
 #define TEMP_SENSOR_2 0
 #define TEMP_SENSOR_3 0
 #define TEMP_SENSOR_4 0
-#define TEMP_SENSOR_BED 0
+#if(ENABLED(BedAC))
+  #define TEMP_SENSOR_BED 11
+#else
+  #define TEMP_SENSOR_BED 0
+#endif
 
 // Dummy thermistor constant temperature readings, for use with 998 and 999
 #define DUMMY_THERMISTOR_998_VALUE 25

Marlin/pins_RUMBA.h

@@ -108,7 +108,7 @@
 //
 #define TEMP_0_PIN         13   // Analog Input
 #define TEMP_1_PIN         15   // Analog Input
-#define TEMP_BED_PIN       14   // Analog Input
+#define TEMP_BED_PIN       57   // Analog Input
 
 // SPI for Max6675 or Max31855 Thermocouple
 #if DISABLED(SDSUPPORT)
@@ -141,7 +141,7 @@
 #define HEATER_1_PIN        7
 //#define HEATER_2_PIN        6
 //#define HEATER_3_PIN        8
-#define HEATER_BED_PIN      -1
+#define HEATER_BED_PIN      58
 
 #define LED4_PIN            8
 #define LASER_PIN          -1