[Skiboot] skiboot v6.0.7 released

[Stewart Smith]

skiboot-6.0.7
*************

skiboot 6.0.7 was released on Friday August 3rd, 2018. It replaces
skiboot-6.0.6 as the current stable release in the 6.0.x series.

It is recommended that 6.0.7 be used instead of any previous 6.0.x
version due to it containing a workaround for hardware errata in the
XIVE interrupt controller (present on POWER9 systems).

The bug fix is:

* xive: Disable block tracker

  Due to some HW errata, the block tracking facility (performance
  optimisation for large systems) should be disabled on Nimbus chips.
  Disable it unconditionally for now.

-- 
Stewart Smith
OPAL Architect, IBM.