Initial arm->chibios pass - simplify some platform logic (#8450)

drivers/chibios/ws2812.h

@@ -0,0 +1,16 @@
+#pragma once
+
+#include "quantum/color.h"
+
+/* User Interface
+ *
+ * Input:
+ *         ledarray:           An array of GRB data describing the LED colors
+ *         number_of_leds:     The number of LEDs to write
+ *
+ * The functions will perform the following actions:
+ *         - Set the data-out pin as output
+ *         - Send out the LED data
+ *         - Wait 50us to reset the LEDs
+ */
+void ws2812_setleds(LED_TYPE *ledarray, uint16_t number_of_leds);