Makefile: remove -march flag

- derp. forgot to get rid of this since we're using -mcpu and it is no
longer needed
Signed-off-by: Luis Cruz <ljc2491@gmail.com>
Revert "CHROMIUM: cpufreq: interactive: run at fraction of hispeed_freq when load is low"

- should have reviewed history prior to commiting. heh
This reverts commit 01725e884f7cc33b86fed5441e85936ee44ca90c.