flo: Add /dev/frandom

Change-Id: I495fba2c8c456c24cce0c0a44619f29d4fc004ee
Signed-off-by: xcstacy <zkchong2005@hotmail.com>
flo: defconfig update

** Enabled frandom:
Frandom is a Linux kernel random number generator, which is 10-50 times
faster than what you get from Linux' built-in /dev/urandom.
** PS2: fix typo

Change-Id: Ie0c5bc552332d21be62db2506c60c5fe67dc2ba0
Signed-off-by: doc <doc.divxm@gmail.com>