warp7: mem_params_desc: Add a file which exports a REGISTER_BL_IMAGE_DESCS
warp7: mem_params_desc: Add a file which exports a REGISTER_BL_IMAGE_DESCS

In order to link even a basic image we need to declare
REGISTER_BL_IMAGE_DESCS. This patch declares an empty structure which is
passed to REGISTER_BL_IMAGE_DESCS(). Later patches will add in some
meaningful data.

Signed-off-by: Bryan O'Donoghue <165dc05575478af93ac2f97f67be6e1756010094@linaro.org>

achingupta/arm-trusted-firmware,achingupta/arm-trusted-firmware