qseecom: Added boundary checks between two subsequent fields

Checking if there is enough room in between the offset of the
two subsequent field so that data of field 2 will not overlap
the data of field 1.

Change-Id: I96f656bb25878a302e7de109dd8f981045ed52e7
Signed-off-by: Nitin LNU <nlakra@codeaurora.org>