MLK-20023 Move Busfreq support to OPTEE OS

MLK-20023 Move Busfreq support to OPTEE OS

  - When OPTEE OS is present and if it support the busfreq
    for the running the i.MX, the busfreq is executed in
    the OPTEE OS by calling a specific SMC function
  - Only a WFE function is copied into the OCRAM to
    synchronize all Cores in multi-core devices
  - OPTEE OS add a DT property 'busfreq=1' in the 'firmware/optee'
    node to indicate the busfreq support

Signed-off-by: Cedric Neveux <cedric.neveux@nxp.com>
Signed-off-by: Arulpandiyan Vadivel <arulpandiyan_vadivel@mentor.com>