Revert "Update ump leaving the mali driver at r2p4"

This reverts commit f9d009d56eff975cf7db0122b16428e8fd357ac2.
Revert "Push GPU to 600MHz as test."

This reverts commit cd239766860a4c0920860f785a579f7c7084029d.
Revert "downgrade to mali r2p4"

This reverts commit dcdb748115d4538eda0d865b73d154e87a8e1980.