ata: pata_parport-bpck6: Declare mode_map as static

Compilation C=1 of the bpck6 protocol module generates the following
message:

drivers/ata/pata_parport/bpck6.c:62:5: warning: symbol 'mode_map' was
not declared. Should it be static?

Fix this by declaring mode_map as static.
Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Reviewed-by: Ondrej Zary <linux@zary.sk>

drivers/ata/pata_parport/bpck6.c

@@ -59,8 +59,8 @@
 #define PPCMODE_EPP_WORD	5
 #define PPCMODE_EPP_DWORD	6
 
-int mode_map[] = { PPCMODE_UNI_FW, PPCMODE_BI_FW, PPCMODE_EPP_BYTE,
-		   PPCMODE_EPP_WORD, PPCMODE_EPP_DWORD };
+static int mode_map[] = { PPCMODE_UNI_FW, PPCMODE_BI_FW, PPCMODE_EPP_BYTE,
+			  PPCMODE_EPP_WORD, PPCMODE_EPP_DWORD };
 
 static void bpck6_send_cmd(struct pi_adapter *pi, u8 cmd)
 {