zynq: Add UART0, UART1 configs support

Zynq uart controller support two serial ports like
CONFIG_ZYNQ_SERIAL_UART0 and CONFIG_ZYNQ_SERIAL_UART1
enabled both so-that the respective board will define
these macros based on their usage.

Signed-off-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>

include/configs/zynq.h

@@ -33,10 +33,22 @@
 	{300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200, 230400}
 
 /* Zynq Serial driver */
-#define CONFIG_ZYNQ_SERIAL
-#define CONFIG_ZYNQ_SERIAL_BASEADDR0	0xE0001000
-#define CONFIG_ZYNQ_SERIAL_BAUDRATE0	CONFIG_BAUDRATE
-#define CONFIG_ZYNQ_SERIAL_CLOCK0	50000000
+#define CONFIG_ZYNQ_SERIAL_UART1
+#ifdef CONFIG_ZYNQ_SERIAL_UART0
+# define CONFIG_ZYNQ_SERIAL_BASEADDR0	0xE0000000
+# define CONFIG_ZYNQ_SERIAL_BAUDRATE0	CONFIG_BAUDRATE
+# define CONFIG_ZYNQ_SERIAL_CLOCK0	50000000
+#endif
+
+#ifdef CONFIG_ZYNQ_SERIAL_UART1
+# define CONFIG_ZYNQ_SERIAL_BASEADDR1	0xE0001000
+# define CONFIG_ZYNQ_SERIAL_BAUDRATE1	CONFIG_BAUDRATE
+# define CONFIG_ZYNQ_SERIAL_CLOCK1	50000000
+#endif
+
+#if defined(CONFIG_ZYNQ_SERIAL_UART0) || defined(CONFIG_ZYNQ_SERIAL_UART1)
+# define CONFIG_ZYNQ_SERIAL
+#endif
 
 /* DCC driver */
 #if defined(CONFIG_ZYNQ_DCC)