x86/tty/serial/8250: Resolve missing-field-initializers warnings

Resolve some missing-field-initializers warnings by using
designated initialization in the expansion of the
SERIAL_PORT_DFNS macro.

Signed-off-by: Mark Rustad <mark.d.rustad@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Link: http://lkml.kernel.org/r/1409972149-26272-1-git-send-email-jeffrey.t.kirsher@intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

arch/x86/include/asm/serial.h

@@ -21,9 +21,9 @@
 
 #define SERIAL_PORT_DFNS			\
 	/* UART CLK   PORT IRQ     FLAGS        */			\
-	{ 0, BASE_BAUD, 0x3F8, 4, STD_COM_FLAGS },	/* ttyS0 */	\
-	{ 0, BASE_BAUD, 0x2F8, 3, STD_COM_FLAGS },	/* ttyS1 */	\
-	{ 0, BASE_BAUD, 0x3E8, 4, STD_COM_FLAGS },	/* ttyS2 */	\
-	{ 0, BASE_BAUD, 0x2E8, 3, STD_COM4_FLAGS },	/* ttyS3 */
+	{ .uart = 0, BASE_BAUD, 0x3F8, 4, STD_COM_FLAGS }, /* ttyS0 */	\
+	{ .uart = 0, BASE_BAUD, 0x2F8, 3, STD_COM_FLAGS }, /* ttyS1 */	\
+	{ .uart = 0, BASE_BAUD, 0x3E8, 4, STD_COM_FLAGS }, /* ttyS2 */	\
+	{ .uart = 0, BASE_BAUD, 0x2E8, 3, STD_COM4_FLAGS }, /* ttyS3 */
 
 #endif /* _ASM_X86_SERIAL_H */