ARM: ep93xx: Don't use modem interface on the second UART

Second UART doesn't have modem interface, so any attempt to use set_mctrl() it
produce unwanted garbage on the line. There's no such 0x100 register offset
for the second UART either.

Signed-off-by: Petr Štetiar <ynezz@true.cz>
Cc: Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Ryan Mallon <rmallon@gmail.com>

arch/arm/mach-ep93xx/core.c

@@ -281,7 +281,7 @@ static AMBA_APB_DEVICE(uart1, "apb:uart1", 0x00041010, EP93XX_UART1_PHYS_BASE,
 	{ IRQ_EP93XX_UART1 }, &ep93xx_uart_data);
 
 static AMBA_APB_DEVICE(uart2, "apb:uart2", 0x00041010, EP93XX_UART2_PHYS_BASE,
-	{ IRQ_EP93XX_UART2 }, &ep93xx_uart_data);
+	{ IRQ_EP93XX_UART2 }, NULL);
 
 static AMBA_APB_DEVICE(uart3, "apb:uart3", 0x00041010, EP93XX_UART3_PHYS_BASE,
 	{ IRQ_EP93XX_UART3 }, &ep93xx_uart_data);