Fix for ARM-TF v1.2

As of ARM Trusted Firmware v1.2, fip_create and cert_create have renamed
some of their parameters using differing naming schemes.  They no longer
take the same parameters.

fip_create renames --bl30 to --scp_bl2.  Note, this uses an underscore,
where the other fip_create parameters use dash/minus.

cert_create has the following parameter renames:

  bl2      ->  tb-fw
  bl30     ->  scp-fw
  bl31     ->  soc-fw
  bl32     ->  tos-fw
  bl33     ->  nt-fw
  bl2u     ->  ap-fwu-cfg
  scp_bl2u ->  scp-fwu-cfg
  ns-bl2u  ->  fwu

Signed-off-by: Ryan Harkin <ryan.harkin@linaro.org>