Merge branch 'skiboot-5.2.x' - 5.2.2 release notes

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+skiboot-5.2.2
+-------------
+
+skiboot-5.2.2 was released on Thursday May 5th, 2016.
+
+skiboot-5.2.2 is the third stable release of skiboot 5.2, the new stable
+release of skiboot, which will take over from the 5.1.x series which was
+first released August 17th, 2015.
+
+Skiboot 5.2.2 replaces skiboot-5.2.1 as the current stable version, which was
+released on April 27th, 2016. Over skiboot-5.2.1, skiboot 5.2.2 contains
+one bug fix targetted at P8NVL systems, notably the Garrison platform.
+
+skiboot-5.2.2 contains all bug fixes as of skiboot-5.1.16.
+
+This is the second release that will follow the (now documented) Skiboot
+stable rules - see doc/stable-skiboot-rules.txt.
+
+Over skiboot-5.2.1, the following fixes are included:
+
+P8NVL/Garrison:
+- PHB3: Fix corruption of pref window register
+    On P8+ Garrison platform, the root port's pref window register might
+    be not writable and we have to emulate the window because of hardware
+    defect. In order to detect that, we read the register content, write
+    inversed value and read the register content again. The register is
+    regarded as read-only if the values from the two continuous read are
+    same. However, the original register content isn't written back and
+    it causes corruption on pref window register if it's writable.
+
+    This fixes the above issue by writing the original content back to
+    the register at the end.