add skiboot-5.5.0-rc3 release notes

Signed-off-by: Stewart Smith <[email protected]>

doc/release-notes/skiboot-5.5.0-rc3.rst

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+.. _skiboot-5.5.0-rc3:
+
+skiboot-5.5.0-rc3
+=================
+
+skiboot-5.5.0-rc3 was released on Wednesday April 5th 2017. It is the third
+release candidate of skiboot 5.5, which will become the new stable release
+of skiboot following the 5.4 release, first released November 11th 2016.
+
+skiboot-5.5.0-rc3 contains all bug fixes as of :ref:`skiboot-5.4.3`
+and :ref:`skiboot-5.1.19` (the currently maintained stable releases).
+
+For how the skiboot stable releases work, see :ref:`stable-rules` for details.
+
+The current plan is to cut the final 5.5.0 by April 8th, with skiboot 5.5.0
+being for all POWER8 and POWER9 platforms in op-build v1.16 (Due April 12th).
+This is a short cycle as this release is mainly targetted towards POWER9
+bringup efforts.
+
+Following skiboot-5.5.0, we will move to a regular six week release cycle,
+similar to op-build, but slightly offset to allow for a short stabilisation
+period. Expected release dates and contents are tracked using GitHub milestone
+and issues: https://github.com/open-power/skiboot/milestones
+
+Over :ref:`skiboot-5.5.0-rc2`, we have the following changes:
+
+- xive: Fix setting of remote NVT VSD
+
+  This fixes a checkstop when using my XIVE exploitation mode on some multi-chip machines.
+
+- core/init: Use '_' as separator in names of "exports" properties
+
+  The names of the properties under /ibm,opal/firmware/exports are used
+  directly by Linux to create files in sysfs. To remain consistent with
+  the existing naming of OPAL sysfs files, use '_' as the separator.
+
+  In particular for the symbol map which is already exported separately,
+   it's cleaner for the two files to have the same name, eg: ::
+
+      /sys/firmware/opal/exports/symbol_map
+      /sys/firmware/opal/symbol_map
+
+- hdata: fix reservation size
+
+  The hostboot reserved ranges are [start, end] pairs rather than
+  [start, end) so we need to stick a +1 in there to calculate the
+  size properly.
+
+- hdat: Add model-name property for OpenPower system
+- hdat: Read description from ibm, vpd binary blob
+- hdat: Populate model property with 'Unknown' in error path