drivers: qpnp-gpio: Port driver to Linux 3.4

Update the gpio_xlate callback due to prototype changes
introduced by this change:

commit 15c9a0ac
Author: Grant Likely <grant.likely@secretlab.ca>
Date:   Mon Dec 12 09:25:57 2011 -0700

    of: create of_phandle_args to simplify return of phandle
    parsing data

Change-Id: I9d6aa57d32388aa21c1a621bf49a7f78769ae06d
Signed-off-by: Michael Bohan <mbohan@codeaurora.org>