Migrate dynamic_keymap.layer_count < 4 where requried (#22091)

Co-authored-by: Nick Brassel <nick@tzarc.org>

keyboards/kb_elmo/aek2_usb/config.h

@@ -22,6 +22,4 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 /* Locking resynchronize hack */
 #define LOCKING_RESYNC_ENABLE
 
-/* reduce EEPROM usage */
-#define DYNAMIC_KEYMAP_LAYER_COUNT 3
 #define LAYER_STATE_8BIT

keyboards/kb_elmo/aek2_usb/info.json

@@ -13,6 +13,9 @@
         "rows": ["D5", "C1", "C4", "D0", "C3", "C2", "B3", "B4"]
     },
     "diode_direction": "COL2ROW",
+    "dynamic_keymap": {
+        "layer_count": 3
+    },
     "indicators": {
         "caps_lock": "B1",
         "num_lock": "B2",