qseecom: Update GP QTEEC related APIs

Updated GP related code:
-Decouple GP related functionality from QSEE
-Add support for processing command in open session call
-Fix Invoke Command API to support contiguous memory only
-Add support for request cancellation command

Change-Id: I827e8fcdb09493266a21d3c4ae9456c2aa8457b3
Signed-off-by: Mona Hossain <mhossain@codeaurora.org>