adm5120: avoid warning caused by wrong AMBA irq values

The amba core throws a warning if -1 is used as an
irq value since upstream commit:

  2eac58d5026e4ec8b17ff8b62877fea9e1d2f1b3
  ARM: amba: make use of -1 IRQs warn

  Make the core warn about the use of -1 (NO_IRQ)

Cange the value of the unused IRQs to zero for the
UART devices to get rid of the warning.

Based on #12729.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

SVN-Revision: 35747

target/linux/adm5120/files/arch/mips/adm5120/common/platform.c

@@ -200,7 +200,7 @@ struct amba_device adm5120_uart0_device = {
 		.end	= ADM5120_UART0_BASE + ADM5120_UART_SIZE - 1,
 		.flags	= IORESOURCE_MEM,
 	},
-	.irq		= { ADM5120_IRQ_UART0, -1 },
+	.irq		= { ADM5120_IRQ_UART0, 0 },
 	.periphid	= 0x0041010,
 };
 
@@ -218,7 +218,7 @@ struct amba_device adm5120_uart1_device = {
 		.end	= ADM5120_UART1_BASE + ADM5120_UART_SIZE - 1,
 		.flags	= IORESOURCE_MEM,
 	},
-	.irq		= { ADM5120_IRQ_UART1, -1 },
+	.irq		= { ADM5120_IRQ_UART1, 0 },
 	.periphid	= 0x0041010,
 };