staging: gasket: apex: place in low power reset until opened

The apex device is left out of reset mode at the end of device
probe/initialize processing.  Add a call to enter reset at the end of
the sequence, triggering power gating and other low power features.

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