iwlagn: iwl-trans.c can't dereference iwl_priv any more

This reaches encapsulation for this file. In order to reach this:
 * move priv->valid_context to iwl_shared
 * move the last_rejected initialization to the upper layer
 * define a wrapper iwl_nic_config in the upper layer that calls to
   cfg->lib->ops->nic_config

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/iwlwifi/iwl-agn.c b/drivers/net/wireless/iwlwifi/iwl-agn.c
index 484f889..7f6c58e 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn.c
@@ -623,9 +623,9 @@
 	 * The default context is always valid,
 	 * the PAN context depends on uCode.
 	 */
-	priv->valid_contexts = BIT(IWL_RXON_CTX_BSS);
+	priv->shrd->valid_contexts = BIT(IWL_RXON_CTX_BSS);
 	if (ucode_flags & IWL_UCODE_TLV_FLAGS_PAN)
-		priv->valid_contexts |= BIT(IWL_RXON_CTX_PAN);
+		priv->shrd->valid_contexts |= BIT(IWL_RXON_CTX_PAN);
 
 	for (i = 0; i < NUM_IWL_RXON_CTX; i++)
 		priv->contexts[i].ctxid = i;
@@ -2880,7 +2880,7 @@
 	struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_PAN];
 	int err = 0;
 
-	if (!(priv->valid_contexts & BIT(IWL_RXON_CTX_PAN)))
+	if (!(priv->shrd->valid_contexts & BIT(IWL_RXON_CTX_PAN)))
 		return -EOPNOTSUPP;
 
 	if (!(ctx->interface_modes & BIT(NL80211_IFTYPE_P2P_CLIENT)))
@@ -2945,7 +2945,7 @@
 {
 	struct iwl_priv *priv = hw->priv;
 
-	if (!(priv->valid_contexts & BIT(IWL_RXON_CTX_PAN)))
+	if (!(priv->shrd->valid_contexts & BIT(IWL_RXON_CTX_PAN)))
 		return -EOPNOTSUPP;
 
 	mutex_lock(&priv->shrd->mutex);