b43: N-PHY: add helper for getting gain table

Also move the code to tables file.

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/b43/tables_nphy.h b/drivers/net/wireless/b43/tables_nphy.h
index 97038c4..2a9d5f1 100644
--- a/drivers/net/wireless/b43/tables_nphy.h
+++ b/drivers/net/wireless/b43/tables_nphy.h
@@ -177,16 +177,8 @@
 void b43_nphy_rev0_1_2_tables_init(struct b43_wldev *dev);
 void b43_nphy_rev3plus_tables_init(struct b43_wldev *dev);
 
-extern const u32 b43_ntab_tx_gain_rev0_1_2[];
-extern const u32 b43_ntab_tx_gain_rev3plus_2ghz[];
-extern const u32 b43_ntab_tx_gain_rev3_5ghz[];
-extern const u32 b43_ntab_tx_gain_rev4_5ghz[];
-extern const u32 b43_ntab_tx_gain_rev5plus_5ghz[];
+const u32 *b43_nphy_get_tx_gain_table(struct b43_wldev *dev);
 
-extern const u32 txpwrctrl_tx_gain_ipa[];
-extern const u32 txpwrctrl_tx_gain_ipa_rev5[];
-extern const u32 txpwrctrl_tx_gain_ipa_rev6[];
-extern const u32 txpwrctrl_tx_gain_ipa_5g[];
 extern const u16 tbl_iqcal_gainparams[2][9][8];
 extern const struct nphy_txiqcal_ladder ladder_lo[];
 extern const struct nphy_txiqcal_ladder ladder_iq[];