doc: Add skeleton OPAL_PCI_EEH_FREEZE_CLEAR docs

Fixes: #101
Signed-off-by: Stewart Smith <stewart@linux.ibm.com>

doc/opal-api/opal-pci-eeh-freeze-clear-26.rst

@@ -0,0 +1,33 @@
+.. _OPAL_PCI_EEH_FREEZE_CLEAR:
+
+OPAL_PCI_EEH_FREEZE_CLEAR
+=========================
+
+.. code-block:: c
+
+   #define OPAL_PCI_EEH_FREEZE_CLEAR		26
+
+   enum OpalEehFreezeActionToken {
+	OPAL_EEH_ACTION_CLEAR_FREEZE_MMIO = 1,
+	OPAL_EEH_ACTION_CLEAR_FREEZE_DMA = 2,
+	OPAL_EEH_ACTION_CLEAR_FREEZE_ALL = 3,
+
+	OPAL_EEH_ACTION_SET_FREEZE_MMIO = 1,
+	OPAL_EEH_ACTION_SET_FREEZE_DMA  = 2,
+	OPAL_EEH_ACTION_SET_FREEZE_ALL  = 3
+   };
+
+   int64_t opal_pci_eeh_freeze_clear(uint64_t phb_id, uint64_t pe_number, uint64_t eeh_action_token);
+
+
+Returns
+-------
+:ref:`OPAL_SUCCESS`
+     Success!
+:ref:`OPAL_PARAMETER`
+     Invalid PHB
+:ref:`OPAL_UNSUPPORTED`
+     PHB doesn't support this operation.
+:ref:`OPAL_HARDWARE`
+     Hardware issue prevents completing operation. OPAL may have detected it
+     being broken.