iwlwifi: extract iwl-csr.h

This patch extract CSR Register definition into separate
header files as most of the definition are commons to both
3945 and 4965.

Definitions specific for 3945 and 4965 are properly prefixed

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/iwlwifi/iwl3945-base.c b/drivers/net/wireless/iwlwifi/iwl3945-base.c
index 7a72048..cc71bdc 100644
--- a/drivers/net/wireless/iwlwifi/iwl3945-base.c
+++ b/drivers/net/wireless/iwlwifi/iwl3945-base.c
@@ -4570,9 +4570,9 @@
 	 * atomic, make sure that inta covers all the interrupts that
 	 * we've discovered, even if FH interrupt came in just after
 	 * reading CSR_INT. */
-	if (inta_fh & CSR_FH_INT_RX_MASK)
+	if (inta_fh & CSR39_FH_INT_RX_MASK)
 		inta |= CSR_INT_BIT_FH_RX;
-	if (inta_fh & CSR_FH_INT_TX_MASK)
+	if (inta_fh & CSR39_FH_INT_TX_MASK)
 		inta |= CSR_INT_BIT_FH_TX;
 
 	/* Now service all interrupt bits discovered above. */