staging: vt6655: Delete function MACbIsIntDisable

Delete function MACbIsIntDisable as it is unused and the name is not
accepted by checkpatch.pl.

Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/2cf96b9b7cf576bdd9d17e54acbc765690b7900b.1661666677.git.philipp.g.hortmann@gmail.com


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