Revert "Revert "Makefile: remove -ftracer flags to keep the kernel smaller and make some order""

This reverts commit 8bb58289c61699f6a5791344583b5b11a28bf4eb.
Makefile: re-add JustArchi GCC flags.
except -ftrace (to keep the kernel a bit smaller) and -fdata-sections (reboot issues)

ref commit: https://github.com/JustArchi/android_build/commit/8e1b82c082a8de9160e6c0fc3ded37b591c3e517