Merge branch 'skiboot-5.2.x' - skiboot 5.2.4 release notes

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+skiboot-5.2.4
+-------------
+
+skiboot-5.2.4 was released on Tuesday July 12th, 2016.
+
+This is the 5th stable release of skiboot 5.2, the new stable release of
+skiboot (first release with 5.2.0 on March 16th 2016).
+
+Skiboot 5.2.4 replaces skiboot-5.2.3 as the current stable version, which was
+released on June 30th 2016. Over skiboot-5.2.3, skiboot 5.2.4 contains bug
+fixes to make skiboot more resilient to errors in the XSCOM engine and some
+build improvements for the pflash utility.
+
+skiboot-5.2.4 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-5.2.3, the following fixes are included:
+
+All platforms:
+- Make the XSCOM engine code more resilient to errors:
+  - hw/xscom: Reset XSCOM engine after querying sleeping core FIR
+  - hw/xscom: Reset XSCOM engine after finite number of retries when busy
+
+Userspace utilities:
+- pflash build improvements