[MIPS] Add UART IRQ number for EV64120

Signed-off-by: Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

include/asm-mips/mach-ev64120/mach-gt64120.h

@@ -42,6 +42,7 @@ extern unsigned long gt64120_base;
 #define EV64120_UART0_REGS_BASE	(KSEG1ADDR(EV64120_COM1_BASE_ADDR))
 #define EV64120_UART1_REGS_BASE	(KSEG1ADDR(EV64120_COM2_BASE_ADDR))
 #define EV64120_BASE_BAUD ( 3686400 / 16 )
+#define EV64120_UART_IRQ	6
 
 /*
  * PCI interrupts will come in on either the INTA or INTD interrups lines,