fix(rcar3-drivers): check loaded NS image area

Check if next NS image invades a previous loaded image.
Correct non secure image area to avoid loading a NS image to secure

Move GZ compressed payload at 32 * compressed payload size offset,
so it is loaded in non-secure area and can be decompressed into
non-secure area too. It is unlikely that the up to 2 MiB compressed
BL33 blob would decompress to payload larger than 64 MiB .

Signed-off-by: Tobias Rist <tobias.rist@joynext.com>
Signed-off-by: Yoshifumi Hosoya <yoshifumi.hosoya.wj@renesas.com>
Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org> # Fix for compressed BL33
Change-Id: I52fd556aab50687e4791e5dbc45d425f802c8757