skiboot v6.6.2 release notes

Signed-off-by: Vasant Hegde <[email protected]>

doc/release-notes/skiboot-6.6.2.rst

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+.. _skiboot-6.6.2:
+
+==============
+skiboot-6.6.2
+==============
+
+skiboot 6.6.2 was released on Friday July 03, 2020. It replaces
+:ref:`skiboot-6.6.1` as the current stable release in the 6.6.x series.
+
+It is recommended that 6.6.2 be used instead of 6.6.1 version due to the
+bug fixes it contains.
+
+Bug fixes included in this release are:
+
+- fsp: Skip sysdump retrieval only in MPIPL boot
+
+- platform/mihawk: Fix IPMI double-free