product/rdn2: Update fast channel config to use transport fc

This change enables rdn2 ram firmware to use transport layer based
fast channel implementation. Necessary changes are added to the
config files of relevant modules.

Signed-off-by: Md Golam Tanvir Zim <mdgolamtanvir.zim@arm.com>
Change-Id: Ia184ec98573ce8874c56dab901446ceab5dd19ee