Add WQ_POWER_EFFICIENT_DEFAULT to defconfig
Revert "arm/dt: remove duplicated GPU entries so that users stop bitching around."

This reverts commit 8ee548e8e93facd7a73f4edc4f669075a086d457.
Drop GPU to 150 MHz
sched: set sched_mc_power_savings to 2, which is the highest power saving possible value for this tunable.
Increase max readahead value