[TEMP] plat/rdfremont: include timer in bl31 for delay assertion

delay() is used for synchronization between AP and RSS MHU initialization.
RSS MHU should be initialized prior to any MHU data request received
from AP.
Optimized the delay count.

Signed-off-by: Sayanta Pattanayak <sayanta.pattanayak@arm.com>
Change-Id: Ic680c90c63d8adddf5706ec825e27a1ecfc74213