doc: skiboot 5.10.1 release notes

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

doc/release-notes/skiboot-5.10.1.rst

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+.. _skiboot-5.10.1:
+
+==============
+skiboot-5.10.1
+==============
+
+skiboot 5.10.1 was released on Thursday March 1st, 2018. It replaces
+:ref:`skiboot-5.10` as the current stable release in the 5.10.x series.
+
+Over :ref:`skiboot-5.10`, we have an improvement for debugging NPU2/NVLink
+problems and a bug fix. These changes are:
+
+- NPU2 HMIs: dump out a *LOT* of npu2 registers for debugging
+- libflash/blocklevel: Correct miscalculation in blocklevel_smart_erase()
+
+  This fixes a bug in pflash.
+
+  If blocklevel_smart_erase() detects that the smart erase fits entire in
+  one erase block, it has an early bail path. In this path it miscaculates
+  where in the buffer the backend needs to read from to perform the final
+  write.
+
+  Fixes: https://github.com/open-power/skiboot/issues/151