Revert "defconfig: build with -O2"

This reverts commit 93a3d8c835e6ad5718cd271e417ea149deef9a63.
Revert "Add flags for -Os, -O2 & -O3 optimization levels"

This reverts commit 857424cfbad24516272021e3273c18a6508879a2.
Revert "Makefile: Optimizing build-options for linaro"

This reverts commit 7a1d451ea85bf5edd57edc9536c4ae1bfacdb217.
Revert "Lets add some moar optimizations"

This reverts commit 841638e3f892e1d473823a52165a8c4ff181332a.
Revert "Makefile: Added Snapdragon optimizations"

This reverts commit 280ebf9161e9eff8fe75b597fabae74c3d5b88d7.