tsec: arrange the code to avoid useless function declaration

This is merely a rearrangement.  No changes to the code, except
to remove now-useless declarations.

Signed-off-by: Mingkai Hu <Mingkai.hu@freescale.com>
Acked-by: Andy Fleming <afleming@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Acked-by: Detlev Zundel <dzu@denx.de>