powerpc/ps3: Move static keyword to the front of declaration

Move the static keyword to the front of declaration of 'vuart_bus_priv',
and resolve the following compiler warning that can be seen when
building with warnings enabled (W=1):

drivers/ps3/ps3-vuart.c:867:1: warning: ‘static’ is not at beginning of declaration [-Wold-style-declaration]
 } static vuart_bus_priv;
 ^
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Xiongfeng Wang <wangxiongfeng2@huawei.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/1588154448-56759-1-git-send-email-wangxiongfeng2@huawei.com

drivers/ps3/ps3-vuart.c

@@ -858,13 +858,13 @@ static int ps3_vuart_handle_port_interrupt(struct ps3_system_bus_device *dev)
 	return 0;
 }
 
-struct vuart_bus_priv {
+static struct vuart_bus_priv {
 	struct ports_bmp *bmp;
 	unsigned int virq;
 	struct mutex probe_mutex;
 	int use_count;
 	struct ps3_system_bus_device *devices[PORT_COUNT];
-} static vuart_bus_priv;
+} vuart_bus_priv;
 
 /**
  * ps3_vuart_irq_handler - first stage interrupt handler