aries | p1: staging: zram: Add auto loading of module if user opens /dev/zram.

Greg spotted that said driver is not subscribing to the automagic
mechanism of auto-loading if a user tries to open /dev/zram.

This fixes it.

CC: Minchan Kim <minchan@kernel.org>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Humberto Borba <humberos@gmail.com>

Change-Id: I140d4ce5b8ab43dcbb73ad69f9835bb44131f10c