staging: vt6656: Remove fall back functions and headers.

Fall back is no longer used in driver so remove all
functions and headers.

Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com>
Link: https://lore.kernel.org/r/33732aad-5905-c173-ea81-431265e4f7e7@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>