ws2812: rename WS2812 to Device

This is more consistent with the other drivers.

ws2812/ws2812.go

@@ -5,31 +5,31 @@ import (
 	"machine"
 )
 
-// WS2812 wraps a pin object for an easy driver interface.
-type WS2812 struct {
+// Device wraps a pin object for an easy driver interface.
+type Device struct {
 	Pin machine.GPIO
 }
 
 // New returns a new WS2812 driver. It does not touch the pin object: you have
 // to configure it as an output pin before calling New.
-func New(pin machine.GPIO) WS2812 {
-	return WS2812{pin}
+func New(pin machine.GPIO) Device {
+	return Device{pin}
 }
 
 // Write the raw bitstring out using the WS2812 protocol.
-func (p WS2812) Write(buf []byte) {
+func (d Device) Write(buf []byte) {
 	for _, c := range buf {
-		p.WriteByte(c)
+		d.WriteByte(c)
 	}
 }
 
 // Write the given color slice out using the WS2812 protocol.
 // Colors are specified in RGB format, and are send out in the common GRB
 // format.
-func (p WS2812) WriteColors(buf []uint32) {
+func (d Device) WriteColors(buf []uint32) {
 	for _, color := range buf {
-		p.WriteByte(byte(color >> 8))  // green
-		p.WriteByte(byte(color >> 16)) // red
-		p.WriteByte(byte(color >> 0))  // blue
+		d.WriteByte(byte(color >> 8))  // green
+		d.WriteByte(byte(color >> 16)) // red
+		d.WriteByte(byte(color >> 0))  // blue
 	}
 }