Integrate support to add DDR FW to the final
FIP image via `fiptool`.
Add mechanism to allow platform specific image
UUID. Add DDR FW entries to toc_entries and create
`plat_fiptool.mk` in order to enable the integration
of the DDR FW binary into the FIP image using
`fiptool` command.
Change-Id: I10c000025378206411ab70dbc5b2e745ffb01e5d
Signed-off-by: Khristine Andreea Barbulescu <khristineandreea.barbulescu@nxp.com>