mdss: mdp: Fix fudge factor overflow check

Fudge adjustment is always 64 bit operation
irrespective of underlying architecture is
32/64 bit. Fix max value to compare overflow
against. Add warning if adjustments can't go
through without overflow.

Change-Id: I9c15ea8c1754c9ddb997546dc476bb6d45198524
Signed-off-by: Animesh Kishore <animeshk@codeaurora.org>