wcnss: Trigger WCNSS driver on first open

WCNSS driver requires a trigger followed by an open, this is to support
the trigger from an external script. However, startup scripts are no
more supported; and wcnss service should always trigger this driver. So
the first open to this driver should also trigger the driver.

Change-Id: I843c044d4fa452ca541a62255bbcb33b9d7f6eb0
Signed-off-by: Sameer Thalappil <sameert@codeaurora.org>