Revert "qseecom: Add support to handle multiple app load & unload"

This reverts commit f856ce3045a68e12089c7dc2152f5c53bb259305.

Change-Id: I31b5994fb42118edd46e453b0d453225c92000a1
(cherry picked from commit a2667c19a1709f4127d3c2376b92871fad99068f)