Change `led` variable in rgb_matrix_drivers to avoid conflicts (#9412)

* Change `led` to `led_matrix` in rgb_matrix_drivers

Is a minor change that only affects the driver file. 

However, this will allow somebody to run rgblight along side rgb matrix
using the ws2812 driver, as well.  Specifically, so you can use the
custom driver for rgblight to set a different pin (barring a change to
the `ws2812_setleds` function).  

Courtesy of discord conversion:
https://discordapp.com/channels/440868230475677696/568161140534935572/721555623191248906

* Change name to be super specific

* Update rgb_matrix_drivers.c

0 files changed, 0 insertions, 0 deletions