[Keyboard] FLX Lodestone (#8451)

[Keyboard] FLX Lodestone (#8451)

* Add Lodestone PCB

Working Firmware for Lodestone PCB tested on physical PCB prototypes.

* Update keyboards/flx/lodestone/lodestone.c

* Update keyboards/flx/lodestone/keymaps/default/config.h

* Update keyboards/flx/lodestone/rules.mk

* Update keyboards/flx/lodestone/readme.md

* Delete config.h

* Update keyboards/flx/lodestone/info.json

Suggested by noroadsleft

* Update keyboards/flx/lodestone/info.json

* Update keyboards/flx/lodestone/info.json

Changed maintainer name as suggested.

* Update keyboards/flx/lodestone/keymaps/default/readme.md

* Update keyboards/flx/lodestone/info.json

* Update keyboards/flx/lodestone/rules.mk

Changed Link_Time_Optimization to LTO didn't know this was a thing :)

* Update keyboards/flx/lodestone/keymaps/default/keymap.c

Removed 2 unessisary layers from the default map.

* Update keyboards/flx/lodestone/readme.md

* Update keyboards/flx/lodestone/info.json

* Changed from LAYOUT to LAYOUT_all

AS suggested by noroadsleft, changed 4 files to match, and re-testeed on my hardware to confirm working.

* Update keyboards/flx/lodestone/config.h

Cleaned up Manu, Product and Descriptor as suggested.

* Update keyboards/flx/lodestone/readme.md