staging: gasket: apex: enable/disable gasket device from apex

Gasket framework now places device drivers in charge of calling APIs to
enable and disable gasket device operations.  Make the appropriate calls
from the apex driver.

Signed-off-by: Todd Poynor <toddpoynor@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>