config: disable debug

idea is taken here - https://github.com/BrateloSlava/SaveEnergy-3/commit/749b083eb39efac5a7154f053a3fe5ac7faa75c5 + https://github.com/rmbq/android_kernel_htc_msm8960/commit/4595a25dd069583dd3a4b1ecdf914f632260190d#diff-03f8376c5e50534ffbe425a43a2c7ad2R3333