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>