firmware: p2560-uc firmware update

firmware: p2560-uc firmware update

v56->v57
  added changes to uC FW that will check to make sure if LED PWM timer0 == Started then check the timer0 start bit and if not set
  then set it to start running again.

v55->v56
- Bump revision to v0_56.
- Changed the following End Point 2 commands:
  LED_UC_DRIVE- This function now does Nothing. Left it in for backwards compatibility.
  (Previously this function setup the Port 1.1 pin to drive from tri-state. And also set the LED pin high (ON).)
  LED_BREATHE_ON- This function now sets up port 1.1 in a drive state from tri-state and starts timer0 for the SW PWM.
  LED_BREATHE_OFF- This function now sets up port 1.1 in a drive state from tri-state.
  Also keeps the same logic as before stopping the SW PWM timer0 and set P1.1 LED LOW (OFF).

Bug 1266521

Change-Id: I2ef12fe6c66e03d299b0135e749498d8154f3937
Signed-off-by: Anshul Jain <anshulj@nvidia.com>
Reviewed-on: http://git-master/r/234431
(cherry picked from commit d110f0290bcd5870abcda7b97affbe2b5d585045)
Reviewed-on: http://git-master/r/246790
Reviewed-by: Jun Yan <juyan@nvidia.com>
Tested-by: Jun Yan <juyan@nvidia.com>
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Diwakar Tundlam <dtundlam@nvidia.com>