Merge branch 'skiboot-5.1.x' into skiboot-5.2.x - 5.1.16 release notes

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+skiboot-5.1.16
+--------------
+
+skiboot-5.1.16 was released on Friday April 29th, 2016.
+
+skiboot-5.1.16 is the 17th stable release of 5.1, it follows skiboot-5.1.15
+(which was released March 16th, 2016).
+
+This release contains a few bug fixes and is a recommended upgrade.
+
+Changes are:
+
+PHB3 (all POWER8 platforms):
+- hw/phb3: Ensure PQ bits are cleared in the IVC when masking IRQ
+  When we mask an interrupt, we may race with another interrupt coming
+  in from the hardware.  If this occurs, the P and/or Q bit may end up
+  being set but we never EOI/clear them.  This could result in a lost
+  interrupt or the next interrupt that comes in after re-enabling never
+  being presented.
+
+  This fixes a bug seen with some CAPI workloads which have lots of
+  interrupt masking at the same time as high interrupt load.  The fix is
+  not specific to CAPI though.
+- hw/phb3: Fix potential race in EOI
+    When we EOI we need to clear the present (P) bit in the Interrupt
+    Vector Cache (IVC).  We must clear P ensuring that any additional
+    interrupts that come in aren't lost while also maintaining coherency
+    with the Interrupt Vector Table (IVT).
+
+  To do this, the hardware provides a conditional update bit in the
+  IVC. This bit ensures that generation counts between the IVT and the
+  IVC updates are synchronised.
+
+  Unfortunately we never set this the bit to conditionally update the P
+  bit in the IVC based on the generation count.  Also, we didn't set
+  what we wanted the new generation count to be if the update was
+  successful.
+
+FSP platforms:
+- OPAL:Handle mbox response with bad status:0x24 during FSP termination
+  OPAL committed a predictive log with SRC BB822411 in some situations.
+
+Generic:
+- hmi: Fix a bug where partial hmi event was reported to host.
+  This bug fix ensures the CPU PIR is reported correctly:
+    [  305.628283] Fatal Hypervisor Maintenance interrupt [Not recovered]
+    [  305.628341]  Error detail: Malfunction Alert
+    [  305.628388] 	HMER: 8040000000000000
+  - [  305.628423]      CPU PIR: 00000000
+  + [  200.123021]    CPU PIR: 000008e8
+    [  305.628458]  [Unit: VSU] Logic core check stop
+