Practice60 RGB and PWM Backlight (#4929)
* Update Practice60 to enable RGB via SPI DMA and use PWM backlight breathing
* Correct stm32f103c8t6 flash size in eeprom definition
* Remove unused files and improve ifdef checks
* Update quantum/rgblight.c
Co-Authored-By: awkannan <andrew.kannan@klaviyo.com>
* Update quantum/rgblight.c
Co-Authored-By: awkannan <andrew.kannan@klaviyo.com>
* EEPROM implementation fix and updated p60 code
* Update define
* Remove dead code
* Update keymap to remove test key
* Update keymap again
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