improve memcopy/memmove
string.c: improve the performance of memcpy and memmove of the general version

the performance of memcpy and memmove of the general version is
very inefficient, this patch improved them.

Signed-off-by: Miao Xie <miaox <at> cn.fujitsu.com>
Add BFS (0.413) Scheduler
LOAD_FREQ (4*HZ+61) avoids loadavg Moire (thx to Klaus Ripke)
fd
Time gpio from 3.8
Logger from 3.4