[Keymap] Cleanup of Drashna code (#7800)

* ifdef rgb stuff like a madman for RGB Coexistance

* Re-enable RGB Light on Planck

* fix RGB Coexistance issue

* Tweak feature settings for Ergodox EZ Glow

* Their powers combine, and I am Captain RGB

This one is for noroadsleft and yan.

* Limit brightness when both RGB features are enabled

* Change shutdown method

* Add RGB Coexistience stuff to keymap

* disable RGBLIGHT_SLEEP until a solution can be found

* Disable Unicode on the kyria

* Fix up Iris rev defines

* Fix up community layouts to compile properly

* Cleanup rgb stuff

* Merge ergodox keymaps

* Update CCCV macro to use tap_code16

* Enable Solenoid on C39

Because josh couldn't

* Enable RGB Light, not Matrix on rev6 keymap

* Only enable LTO on non-ARM boards

* Clean up Bootmagic OLED display

* Enable RGBLIGHT_SPLIT on kyria

Not that it does anything

* Add hotkey for discord

users/drashna/drashna.c

@@ -121,9 +121,13 @@ void shutdown_user(void) {
     rgblight_setrgb_red();
 #endif  // RGBLIGHT_ENABLE
 #ifdef RGB_MATRIX_ENABLE
+#    ifdef __AVR__
     rgb_matrix_set_color_all(0xFF, 0x00, 0x00);
     rgb_matrix_update_pwm_buffers();
-
+#    else
+    rgb_matrix_sethsv_noeeprom(0, 255, 255);
+    rgb_matrix_mode_noeeprom(1);
+#    endif
 #endif  // RGB_MATRIX_ENABLE
     shutdown_keymap();
 }