staging: agnx, fix bssid compiler warnings

conf->bssid is const. Propagate const to not get compiler warnings:
agnx/pci.c: In function ‘agnx_config_interface’:
agnx/pci.c:319: warning: passing argument 2 of ‘agnx_set_bssid’ discards qualifiers from pointer target type
agnx/pci.c:321: warning: passing argument 2 of ‘hash_write’ discards qualifiers from pointer target type

Signed-off-by: Jiri Slaby <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/agnx/phy.c

···
 	iowrite32(reg, ctl + AGNX_RXM_MACLO);
 }
 
-static void receiver_bssid_set(struct agnx_priv *priv, u8 *bssid)
+static void receiver_bssid_set(struct agnx_priv *priv, const u8 *bssid)
 {
 	void __iomem *ctl = priv->ctl;
 	u32 reg;
···
 	return 0;
 }
 
-void agnx_set_bssid(struct agnx_priv *priv, u8 *bssid)
+void agnx_set_bssid(struct agnx_priv *priv, const u8 *bssid)
 {
 	receiver_bssid_set(priv, bssid);
 }

drivers/staging/agnx/phy.h

···
 void agnx_hw_init(struct agnx_priv *priv);
 int agnx_hw_reset(struct agnx_priv *priv);
 int agnx_set_ssid(struct agnx_priv *priv, u8 *ssid, size_t ssid_len);
-void agnx_set_bssid(struct agnx_priv *priv, u8 *bssid);
+void agnx_set_bssid(struct agnx_priv *priv, const u8 *bssid);
 void enable_power_saving(struct agnx_priv *priv);
 void disable_power_saving(struct agnx_priv *priv);
 void calibrate_antenna_period(unsigned long data);

drivers/staging/agnx/sta.c

···
 	printk(PFX "RX hash cmd are : %.8x%.8x\n", reghi, reglo);
 }
 
-void hash_write(struct agnx_priv *priv, u8 *mac_addr, u8 sta_id)
+void hash_write(struct agnx_priv *priv, const u8 *mac_addr, u8 sta_id)
 {
 	void __iomem *ctl = priv->ctl;
 	u32 reghi, reglo;

drivers/staging/agnx/sta.h

···
 	/* 802.11(abg) beacon */
 } __attribute__((__packed__));
 
-void hash_write(struct agnx_priv *priv, u8 *mac_addr, u8 sta_id);
+void hash_write(struct agnx_priv *priv, const u8 *mac_addr, u8 sta_id);
 void hash_dump(struct agnx_priv *priv, u8 sta_id);
 void hash_read(struct agnx_priv *priv, u32 reghi, u32 reglo, u8 sta_id);
 void hash_delete(struct agnx_priv *priv, u32 reghi, u32 reglo, u8 sta_id);