Change PLATFORM payload in correct format.

Change PLATFORM payload in correct format.

Removes enclosing array, href and rep from the platform payload.

It changes structure from
[{
  href: "",
  rep: {
   platform payload
  }
}]
to
{
  platform payload

}

Change-Id: I4f475bbbaba905806fba163bb379a47a866e3011
Signed-off-by: Habib Virji <habib.virji@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/4469
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>