qseecom: Check for FDE/PFE feature

Add checks for PFE/FDE feature before executing anything
related to the feature.

Change-Id: I575d4d4eea29fd9ae59e47805793f2416a97f5b9
Signed-off-by: Mona Hossain <mhossain@codeaurora.org>
Signed-off-by: Zhen Kong <zkong@codeaurora.org>