cr50: try recovering from rolling rebootsstabilize-8688.B

Sometimes a perfectly sane image enters rolling reboot mode in case
some data change triggered a bug which prevents the normal startup and
causes a reset.

The most likely task causing in in case of cr50 would be the tpm task.

Let's add another check of the restart counter: should it reach the
value of 50, do not start the TPM task.

BRANCH=none
BUG=chrome-os-partner:55708

TEST=with this code plus an unaligned access introduced in tpm
     initialization sequence in both RW_A and RW_B, program the full
     image on the dev board.

     Observe the device reset 50 time is rapid succession and then
     stop with the following message on the console:

  Bldr |511709
  retry|50
  Himg =4F992103..408D193E
  Hfss =384E4655..EE13EBD0
  Hinf =44D21600..B70529BD
  jump @00044000

  --- UART initialized after reboot ---
  [Reset cause: rtc-alarm]
  [Image: RW, cr50_v1.1.5044-8d6f7a2+ private-cr51:v0.0.68-633229c ...
  + cryptoc:v0.0.4-5319e83 2016-08-07 19:37:16 vbendeb@kvasha]
  [0.004130 Inits done]
  [0.006919 Active NVram partition set to 0]
  Console is enabled; type HELP for help.
  > system_rolling_reboot_suspected: roling reboots suspected. Try \
   powercycling to clear
   this condition.
  [0.010502 Task 2 (TPM) exited!]

Change-Id: I6b08c5c1a02da9edf9bdf394e57cc56d2e595ad1
Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/366892
Reviewed-by: Bill Richardson <wfrichar@chromium.org>

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