kint36: set correct EEPROM size (#12946)

The Teensy 3.6 comes with 4096 bytes of EEPROM.

This is commit 1 of 2 to make the EEPROM work.
The next commit changes the core code to wire up the EEPROM.

keyboards/kinesis/kint36/config.h

@@ -64,3 +64,5 @@
 #define LED_CAPS_LOCK_PIN C7
 #define LED_SCROLL_LOCK_PIN A5
 #define LED_COMPOSE_PIN E26
+
+#define EEPROM_SIZE 4096