input: i8042: Use remove() instead of exported functions

We should not have exported functions in a driver. The i8042_disable()
function is used to disable the keyboard. Provide a remove() method
instead, which is the standard way of disabling a device.

We could potentially add a method to flush input but that does not seem
necessary.

Signed-off-by: Simon Glass <sjg@chromium.org>

include/i8042.h

@@ -72,19 +72,4 @@
 #define BRK		0x0100	/* make break flag for keyboard */
 #define ALT		0x0200	/* right alt */
 
-/* exports */
-
-/**
- * Flush all buffer from keyboard controller to host.
- */
-void i8042_flush(void);
-
-/**
- * Disables the keyboard so that key strokes no longer generate scancodes to
- * the host.
- *
- * @return 0 if ok, -1 if keyboard input was found while disabling
- */
-int i8042_disable(void);
-
 #endif /* _I8042_H_ */