machine/usb/descriptor: avoid bytes package

We can't use the bytes package in Go 1.24 since it would result in an
import cycle. Therefore, use bytealg.Index instead.

(I'm not sure this code is correct - just searching for a range of bytes
seems brittle. But at least this commit shouldn't change the code).

src/machine/usb/descriptor/hid.go

@@ -1,9 +1,9 @@
 package descriptor
 
 import (
-	"bytes"
 	"errors"
 	"internal/binary"
+	"internal/bytealg"
 )
 
 var configurationCDCHID = [configurationTypeLen]byte{
@@ -87,7 +87,7 @@ func FindClassHIDType(des, class []byte) (ClassHIDType, error) {
 
 	// search only for ClassHIDType without the ClassLength,
 	// in case it has already been set.
-	idx := bytes.Index(des, class[:ClassHIDTypeLen-2])
+	idx := bytealg.Index(des, class[:ClassHIDTypeLen-2])
 	if idx == -1 {
 		return ClassHIDType{}, errNoClassHIDFound
 	}