Revert "mali: ux500: don't half freq on ape_opp=50"

This reverts commit d02ea431ad5941caa713882fd91774f6345c3cc2.

Conflicts:

	drivers/gpu/mali/mali400ko/driver/src/devicedrv/mali/platform/ux500/mali_platform.c
mali: ux500 OC module v2.0

Signed-off-by: Shilin Victor <chrono.monochrome@gmail.com>
performance: restore APE_100_OPP requirements

Signed-off-by: Shilin Victor <chrono.monochrome@gmail.com>
mali: ux500: improved OC stability

Signed-off-by: Shilin Victor <chrono.monochrome@gmail.com>
mali: ux500: fix derpage in unboost logic and instability issues

Signed-off-by: Shilin Victor <chrono.monochrome@gmail.com>