qseecom: Fix stack overflow issue

During qseecom load app, module checks whether the app is
already loaded or not, during this call flow stack pointer
is passed to caller APIs which leads to stack overflow.
Hence memory allocation is moved to Heap.

Change-Id: Iae39edce890f69cd751159754caed5bc29f2be67
Signed-off-by: AnilKumar Chimata <anilc@codeaurora.org>