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
block: cfq: merge tweaked tunables.

Signed-off-by: Francisco Franco <franciscofranco.1990@gmail.com>
kgsl: Set GPU Power Level to low when idle
kgsl: restore gpu freq on wake for performance gov
kgsl: Not change to low power on performance - Thanks Ramgear
Fix redundant statement