[PATCH RESEND] LEDS-One-Shot-Timer-Trigger-implementation

[Shuah Khan]

LED infrastructure lacks support for one shot timer trigger and activation.
The current support allows for setting two timers, one for specifying how
long a state to be on, and the second for how long the state to be off. For
example, delay_on value specifies the time period an LED should stay in on
state, followed by a delay_off value that specifies how long the LED should
stay in off state. The on and off cycle repeats until the trigger gets
deactivated. There is no provision for one time activation to implement
features that require an on or off state to be held just once and then stay
in the original state forever.

This feature will help implement vibrate functionality which requires one
time activation of vibrate mode without a continuous vibrate on/off cycles.