Revert "mako_defconfig: compile with slub"

This reverts commit c150c187b82e3aa3f8af98bd7e9ea0207534a6eb.
Revert "ak-mako-build: compile kernel with Linato 4.7.3"

This reverts commit d4b72f4b0f56e7dd397f941ac2ab5945885d326e.
makefile: re-add O3 here and here
Kernel Version: AK.NEO.0x017