Cleanup and revise TTY interface

src/gopheros/kernel/driver/tty/tty.go

@@ -1,19 +0,0 @@
-package tty
-
-import "io"
-
-// Tty is implemented by objects that can register themselves as ttys.
-type Tty interface {
-	io.Writer
-	io.ByteWriter
-
-	// Position returns the current cursor position (x, y).
-	Position() (uint16, uint16)
-
-	// SetPosition sets the current cursor position to (x,y). Console implementations
-	// must clip the provided cursor position if it exceeds the console dimensions.
-	SetPosition(x, y uint16)
-
-	// Clear clears the terminal.
-	Clear()
-}