Adds Planck Rev 7 & Updates rev6_drop to Matrix Lite Implementation (#21175)

* adds planck/rev7

* Remove config.h include

Co-authored-by: Drashna Jaelre <drashna@live.com>

* convert planck matrices to lite implementation

---------

Co-authored-by: Drashna Jaelre <drashna@live.com>

keyboards/planck/rev7/keymaps/default/config.h

@@ -0,0 +1,49 @@
+/* Copyright 2015-2023 Jack Humbert
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#ifdef AUDIO_ENABLE
+#    define STARTUP_SONG SONG(PLANCK_SOUND)
+// #define STARTUP_SONG SONG(NO_SOUND)
+
+#    define DEFAULT_LAYER_SONGS \
+        { SONG(QWERTY_SOUND), SONG(COLEMAK_SOUND), SONG(DVORAK_SOUND) }
+#endif
+
+/*
+ * MIDI options
+ */
+
+/* enable basic MIDI features:
+   - MIDI notes can be sent when in Music mode is on
+*/
+
+#define MIDI_BASIC
+
+/* enable advanced MIDI features:
+   - MIDI notes can be added to the keymap
+   - Octave shift and transpose
+   - Virtual sustain, portamento, and modulation wheel
+   - etc.
+*/
+// #define MIDI_ADVANCED
+
+/* override number of MIDI tone keycodes (each octave adds 12 keycodes and allocates 12 bytes) */
+// #define MIDI_TONE_KEYCODE_OCTAVES 2
+
+// Most tactile encoders have detents every 4 stages
+#define ENCODER_RESOLUTION 4