Revert "acpuclock: Activate 864mhz (702mhz and next 1026mhz maybe to high)"

This reverts commit dbd2555f22089ddf1494e558f3952d1e4f224e30.
Revert "cpufreq: smartmax: Test ideal freq 864mhz (we don't need 1026 as ideal freq, because we have swipe boost) Needs some testing. Change touch and boost freq to 864mhz. I dont't know if it have some effects... We don't really need it, because of swipe boost. Let's test it (="

This reverts commit 6d0d5d16af1813d0977c364e84fd3cee994b6b39.
Revert "Revert "mm: change initial readahead window size calculation""

This reverts commit 6d6da43f2ed347fcc0620f2fc9af3321f331af3e.
Revert "Revert "block: row-iosched idling triggered by readahead pages""

This reverts commit 69baf4e03d180233b146e599d5055030248862e3.
Revert "Revert "mm: pass readahead info down to the i/o scheduler""

This reverts commit 1475066d7393943a28f7ab868cd9feefff4cfa0c.
Readahead: Optimize divide/multiply by power of 2 using L/R shift (thx ramgear)
readahead: Fix an error (thx ramgear)
int_sqrt.c: Correction square root algo with naming
int_sqrt: Improve 3x faster integer sqrt.

Result on 10,000,000 call.
Old:
sqrt(12345689) = 3513
real	0m0.768s
user	0m0.760s
sys	0m0.004s

New:
sqrt(12345689) = 3513
real	0m0.222s
user	0m0.224s
sys	0m0.000s