Revert "msm: msm_fb: Do not use ION_IOMMU_UNMAP_DELAYED flag."

This reverts commit c0f1aa3616669bb8803a5e561786725f07ebb5f4.
ApexQ: Overclock L2

During certain real time CPU intensive tasks (such as voice recognition)
ApexQ is experiencing frequent L1/TLB sync errors/reboots. Overclock L2
to allow the sync to occur.