[Keymap] Drashna Corne Keyboard updates (#5903)

[Keymap] Drashna Corne Keyboard updates  (#5903)

* Re-enable Audio

And there was much rejoicingmake keebio/iris/rev2:drashna AUDIO_ENABLE=yes!

* Re-add debounce to ergodox EZ

* Fix rgb matrix helper function

* Make sure that RGM Matrix is checked properly

* Fix merge commit?

* Disable more RGB matrix modes

* Increase Debounce for Ergodox EZ

The performance improvements have made it necessary, actually

* Consolidate RGB Matrix layer indication function

And changes to iris

* Fix lighting issue for gamepad

* Update Corne Keyboard configuration

* Update Corne Keyboard layout

* Update KC_MAKE macro to better handle crkbd split

* Tweaks to Corne Keyboard Layout

* Enable RGB Matrix Sleep

* Update my code to use layer_state_t typedef