jtag: driver: make local functions static

The functions:
- interface_jtag_add_callback();
- interface_jtag_add_callback4();
are not referenced outside the file.

Make them static.

Change-Id: I84f738309d23c8d0b5329aa04436db750cf185e5
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: https://review.openocd.org/c/openocd/+/8543
Tested-by: jenkins

src/jtag/drivers/driver.c

@@ -341,7 +341,7 @@ int interface_jtag_add_sleep(uint32_t us)
 }
 
 /* add callback to end of queue */
-void interface_jtag_add_callback4(jtag_callback_t callback,
+static void interface_jtag_add_callback4(jtag_callback_t callback,
 		jtag_callback_data_t data0, jtag_callback_data_t data1,
 		jtag_callback_data_t data2, jtag_callback_data_t data3)
 {
@@ -395,7 +395,7 @@ static int jtag_convert_to_callback4(jtag_callback_data_t data0,
 	return ERROR_OK;
 }
 
-void interface_jtag_add_callback(jtag_callback1_t callback, jtag_callback_data_t data0)
+static void interface_jtag_add_callback(jtag_callback1_t callback, jtag_callback_data_t data0)
 {
 	jtag_add_callback4(jtag_convert_to_callback4, data0, (jtag_callback_data_t)callback, 0, 0);
 }

src/jtag/drivers/minidriver_imp.h

@@ -17,12 +17,6 @@ static inline void interface_jtag_add_scan_check_alloc(struct scan_field *field)
 	field->in_value = cmd_queue_alloc(num_bytes);
 }
 
-void interface_jtag_add_callback(jtag_callback1_t f, jtag_callback_data_t data0);
-
-void interface_jtag_add_callback4(jtag_callback_t f, jtag_callback_data_t data0,
-				  jtag_callback_data_t data1, jtag_callback_data_t data2,
-				  jtag_callback_data_t data3);
-
 void jtag_add_callback4(jtag_callback_t f, jtag_callback_data_t data0,
 			jtag_callback_data_t data1, jtag_callback_data_t data2,
 			jtag_callback_data_t data3);