staging: gasket: remove pointless gasket_interrupt_pause()

gasket_interrupt_pause() does nothing, and no one calls it, so remove it
as it is dead-weight.

Cc: Rob Springer <rspringer@google.com>
Cc: John Joseph <jnjoseph@google.com>
Cc: Ben Chan <benchan@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>