[include][pow2] spiff up log2_uint to calculate for non powers of 2
[include][pow2] spiff up log2_uint to calculate for non powers of 2

-currently will calculate the log2 of the input rounded down to the
nearest power of 2.

sndnvaps/lk,srodrig1/lk,grub4android/lk,travisg/lk,GCrean/lk,ErikCorryGoogle/lk,littlekernel/lk,minglun-tsai/lk,littlekernel/lk,srodrig1/lk,M1cha/lk,sndnvaps/lk,travisg/lk,nvll/lk,nvll/lk,GCrean/lk,srodrig1/lk,skabet/lk,littlekernel/lk,grub4android/lk,hollanderic/lkstuff,hollanderic/lkstuff,sndnvaps/lk,sndnvaps/lk,hollanderic/lkstuff,grub4android/lk,nvll/lk,M1cha/lk,skabet/lk,M1cha/lk,GCrean/lk,grub4android/lk,hollanderic/lkstuff,skabet/lk,travisg/lk,skabet/lk,grub4android/lk,ErikCorryGoogle/lk,nvll/lk,nvll/lk,GCrean/lk,sndnvaps/lk,ErikCorryGoogle/lk,minglun-tsai/lk,skabet/lk,M1cha/lk,ErikCorryGoogle/lk,minglun-tsai/lk,minglun-tsai/lk,srodrig1/lk,travisg/lk,srodrig1/lk,M1cha/lk,littlekernel/lk,GCrean/lk