Remove InternalFailure error from LastRebootTime

That error will never be returned.

Change-Id: I7cebfbb3c703216592f16dbdfeba0a982c9f8a6a
Signed-off-by: Matt Spinler <spinler@us.ibm.com>

Author: spinler

xyz/openbmc_project/State/BMC.interface.yaml

@@ -21,8 +21,6 @@ properties:
      description: >
         The last time at which the BMC came out of a reboot as
         determined by its uptime, in epoch time, in milliseconds.
-     errors:
-        - xyz.openbmc_project.Common.Error.InternalFailure
 
 enumerations:
    - name: Transition