usb: emul: Remove maxpacketsize in usb_emul_setup_device()

This parameter is never used.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/drivers/usb/emul/sandbox_keyb.c b/drivers/usb/emul/sandbox_keyb.c
index 2735985..cff0176 100644
--- a/drivers/usb/emul/sandbox_keyb.c
+++ b/drivers/usb/emul/sandbox_keyb.c
@@ -208,8 +208,7 @@
 	fs[2].id = STRINGID_SERIAL;
 	fs[2].s = dev->name;
 
-	return usb_emul_setup_device(dev, PACKET_SIZE_8, plat->keyb_strings,
-				     keyb_desc_list);
+	return usb_emul_setup_device(dev, plat->keyb_strings, keyb_desc_list);
 }
 
 static int sandbox_keyb_probe(struct udevice *dev)