qseecom: Fix failure to load cmnlib image

Set the physical address field of load_req data struct
correctly using the right ion_phys API. Without this,
secure domain is not able to address/dereference memory
where cmnlib image resides.

Change-Id: I9f75e78227e4eee89fff9ad8b19701ff08e5d90a
Signed-off-by: Mona Hossain <mhossain@codeaurora.org>
Signed-off-by: Zhen Kong <zkong@codeaurora.org>