i2c: diolan-u2c: reword according to newest specification

Change the wording of this driver wrt. the newest I2C v7 and SMBus 3.2
specifications and replace "master/slave" with more appropriate terms.

Signed-off-by: Wolfram Sang <[e-mail]>
Acked-by: Guenter Roeck <[e-mail]>
Reviewed-by: Andi Shyti <[e-mail]>
Signed-off-by: Andi Shyti <[e-mail]>

drivers/i2c/busses/i2c-diolan-u2c.c

···
 }
 
 static const struct i2c_algorithm diolan_usb_algorithm = {
-	.master_xfer = diolan_usb_xfer,
+	.xfer = diolan_usb_xfer,
 	.functionality = diolan_usb_func,
 };