spi: remove machine.SPI and replace with drivers.SPI interface for almost all SPI drivers

Signed-off-by: deadprogram <ron@hybridgroup.com>

apa102/apa102.go

@@ -6,6 +6,8 @@ package apa102 // import "tinygo.org/x/drivers/apa102"
 import (
 	"image/color"
 	"machine"
+
+	"tinygo.org/x/drivers"
 )
 
 const (
@@ -23,20 +25,20 @@ var startFrame = []byte{0x00, 0x00, 0x00, 0x00}
 
 // Device wraps APA102 SPI LEDs.
 type Device struct {
-	bus   SPI
+	bus   drivers.SPI
 	Order int
 }
 
 // The SPI interface specifies the minimum functionality that a bus
 // implementation needs to provide for use by the APA102 driver.  Hardware
 // SPI from the TinyGo "machine" package implements this already.
-type SPI interface {
-	Tx(w, r []byte) error
-	Transfer(b byte) (byte, error)
-}
+// type SPI interface {
+// 	Tx(w, r []byte) error
+// 	Transfer(b byte) (byte, error)
+// }
 
 // New returns a new APA102 driver. Pass in a fully configured SPI bus.
-func New(b SPI) Device {
+func New(b drivers.SPI) Device {
 	return Device{bus: b, Order: BGR}
 }