Revert "ak_mako_defconfig: set min 270Mhz and max 1728Mhz"

This reverts commit 8b476bb1f5cb91111f8a29696fb86ba8c7b2cd73.
fs/namespace.c: Activate NOATIME and NODIRATIME By Default
slub.c: Remove PAGE_ALLOC_COSTLY_ORDER - +3% boost
timer: optimize apply_slack()

__fls(mask) is equivalent to find_last_bit(&mask, BITS_PER_LONG), but cheaper.
find_last_bit was showing up high on the list when I was profiling for stalls
on icache misses on a system with very small cache size (MIPS).

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Kernel Version: AK.307.KXP