Revert "dts: msm8974ac GPU overclocking to 688MHz"

This reverts commit d861ea5fa49658101e37f508b19335b16ff47e22.
Revert "dts: Initial overclocking for OnePlus One"

This reverts commit 44a69643af6099d5e390e26fba523e732cd884fa.
dts: Initial overclocking for OnePlus One (reverted from commit 44a69643af6099d5e390e26fba523e732cd884fa)
msm8974pro: dts: Initial overclocking for OnePlus One