[Keyboard] move ymd75 to ymdk vendor folder (#15645)

keyboards/ymdk/ymd75/rev3/config.h

@@ -0,0 +1,10 @@
+#pragma once
+
+#define MATRIX_ROWS 12
+#define MATRIX_COLS 9
+#define MATRIX_ROW_PINS { B7, B3, B2, B1, B0, E6, F0, F1, F4, F5, F6, F7 }
+#define MATRIX_COL_PINS { D0, D1, D2, D3, D5, D4, D6, D7, B4 }
+#define BACKLIGHT_PIN B6 // change the backlight pin that has since changed in Rev 3
+#define DIODE_DIRECTION ROW2COL
+#define DEVICE_VER      0x0300
+#define RGBLIGHT_EFFECT_KNIGHT_OFFSET 4