qseecom: Check the return value of "ion_phys"

Check for return value of "ion_phys" and handle
the error cases appropriately.

Change-Id: Ib4f24af24de2b2553ed91479f46b2f79e0be0446
Signed-off-by: Hariprasad Dhalinarasimha <hnamgund@codeaurora.org>
Signed-off-by: Zhen Kong <zkong@codeaurora.org>
Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>
qseecom: register bus bandwidth mode when loading app

When there are multiple running qseecom clients, ce clock may be disabled
by one client while TZ is still loading another client's app, which will
lead to load app failure. So, we make a change to register bus bandwidth
mode before loading app and avoid to disable clock when current bandwidth
mode is not INACTIVE.

Change-Id: I1727f6fc038baf95da39089e1f0faefe42f3d40c
Signed-off-by: Zhen Kong <zkong@codeaurora.org>
Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>
qseecom: update cumulative_mode and timer properly

qseecom.cumulative_mode is used to track the cummulative bus request
mode from all concurrent running clients. It is registered before
send_cmd operation, but is not un-registered after it is complete.
This may cause the bus bandwidth is restored to a wrong mode after
resuming from sleep. Thus, we make change to update it accordingly.
qseecom.current_mode is also updated in suspend/resume function to
ensure timer can scale down bus bw after resume when cumulative_mode
is non-zero. Besides, timer operation is optimized in case there are
multiple unserialized concurrent users of the same timer.

Change-Id: I06043d2b88a47e24da03460fe1ae26a94cb6a608
Signed-off-by: Zhen Kong <zkong@codeaurora.org>
Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>