TCA8418 initial config + basic 3x4 keypad config (#6422)

* TCA8418 with base config for 3x4 keypad

* replaced k with uppercase K

* change detection method

* reflect changes  #6381

---------

Co-authored-by: Ben Meadors <benmmeadors@gmail.com>

src/detect/ScanI2C.h

@@ -18,7 +18,7 @@ class ScanI2C
         TDECKKB,
         BBQ10KB,
         RAK14004,
-        PMU_AXP192_AXP2101,
+        PMU_AXP192_AXP2101, // has the same adress as the TCA8418KB
         BME_680,
         BME_280,
         BMP_280,
@@ -70,6 +70,7 @@ class ScanI2C
         DFROBOT_RAIN,
         DPS310,
         LTR390UV,
+        TCA8418KB,
     } DeviceType;
 
     // typedef uint8_t DeviceAddress;