staging: gasket: apex: move PCI core calls to apex driver

Apex driver moves PCI core calls like probe, enable, and remove from
gasket to apex.  Call new functions in gasket to register apex as a PCI
device to the gasket framework.

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