aries | p1: drop s3c_fb's buffers back to 2

It's not necessary. So the reason is just conserve
RAM memory by dropping it back to 2 as it was used
on stock versions.

Signed-off-by: Humberto Borba <humberos@gmail.com>
Change-Id: I50392a08c5af45704fe02362cb2d49308366ad24