drivers: char: add 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.And it uses very little (/dev/frandom) or none (/dev/erandom) of the kernel's entropy pool, so it is very useful for applications that require a handy source for lots of random data.

http://www.billauer.co.il/frandom.html

Signed-off-by: Pafcholini <pafcholini@gmail.com>
add frandom to config
mdnie: toggling mdnie negative effect with home button

pressing home button 4 times will toggle screen negative effect. the delay between consecutive button presses should be less than 300 miliseconds.

Conflicts:
	drivers/input/keyboard/gpio_keys.c

Change-Id: I07e60b2f935bca154ca965f080b5052b56528050

Conflicts:
	drivers/video/samsung/mdnie.c

Conflicts:
	drivers/input/keyboard/gpio_keys.c
mdnie: fix negative toggle build error