Compelet LED timer and cleanup

Add hz(ms) show/store kobj and merge status & control into value
remove usage(it's just for fun XD )

Set LED status default to 1(on);
set timer hz default to 300 ms;
and then all avalibal value is 1/0 for value & timer_controler.

Signed-off-by: Keven Liu <airk908@gmail.com>