msm: mdss: Always allocate SMP during pipe programming

SMP allocation should be independent of changing pipe parameters.
Always allocate SMP's during pipe programming. This avoids fetch
failures when overlay set is not repeatedly called during a rotator
session.

Change-Id: I682585986f37477f1d88d8f3462eee81143b181e
Signed-off-by: Sree Sesha Aravind Vadrevu <svadrevu@codeaurora.org>