Revert "Makefile: adding config variable for Os/O2/O3 compilation"

This reverts commit 57798a69f2081b79ef39b8a83ba2e450fc351bcb.
Revert "adding one last linaro build flag"

This reverts commit db8019bf8caa3ae20f6bf06e712297800419beab.
Revert "Makefile: Optimizing build-options for linaro"

This reverts commit 602763d65729320b5ef228b165d9007cf801f07f.
Revert "Makefile: Added ARM optimizations"

This reverts commit 0503f2480dad014ded38b278d4c99a5c0c0d2c5a.

Conflicts:
	Makefile