ice: Add code to support older implementation

If ice_fde_flag is not configured which means older design is
in-place. New logic is added to handle old scenario to avoid boot
up issues.

Change-Id: I0dce89c0665bdc41e0d6c50f0b1f777b22e4d4d5
Signed-off-by: AnilKumar Chimata <anilc@codeaurora.org>