hikey: Add define for UART2

Change-Id: I54869151bfc434df66933bd418c70cca9c3d0861
Signed-off-by: Michalis Pappas <mpappas@fastmail.fm>

plat/hisilicon/hikey/include/hikey_def.h

@@ -40,6 +40,7 @@
  * PL011 related constants
  */
 #define PL011_UART0_BASE		0xF8015000
+#define PL011_UART2_BASE		0xF7112000
 #define PL011_UART3_BASE		0xF7113000
 #define PL011_BAUDRATE			115200
 #define PL011_UART_CLK_IN_HZ		19200000