Add skiboot 5.4.3 release notes

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

doc/release-notes/skiboot-5.4.3.rst

@@ -0,0 +1,18 @@
+.. _skiboot-5.4.3:
+
+=============
+skiboot-5.4.3
+=============
+
+skiboot-5.4.3 was released on Monday January 16th, 2017. It replaces
+:ref:`skiboot-5.4.2` as the current stable release.
+
+Over :ref:`skiboot-5.4.2`, we have a small number of bug fixes:
+
+- Makefile: Disable stack protector due to gcc problems
+- Makefile: Use -ffixed-r13.
+  We use r13 for our own stuff, make sure it's properly fixed
+- phb3: Lock the PHB on set_xive callbacks
+- arch_flash_arm: Don't assume mtd labels are short
+- Stop using 3-operand cmp[l][i] for latest binutils
+- hw/phb3: fix error handling in complete reset