ARM: mxs: add support for I2SE Duckbill 2 boards

The Duckbill devices are small, pen-drive sized boards based on
NXP's i.MX28 SoC. While the initial variants (Duckbill series)
were equipped with a micro SD card slot only, the latest generation
(Duckbill 2 series) have an additional internal eMMC onboard.

To distinguish between both generations, a new device tree
compatible string was introduced. To get the MAC address fixup
applied, we need to check for this new string here, too.

Signed-off-by: Michael Heimpold <michael.heimpold@i2se.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/mach-mxs/mach-mxs.c

@@ -419,7 +419,8 @@ static void __init mxs_machine_init(void)
 		crystalfontz_init();
 	else if (of_machine_is_compatible("eukrea,mbmx283lc"))
 		eukrea_mbmx283lc_init();
-	else if (of_machine_is_compatible("i2se,duckbill"))
+	else if (of_machine_is_compatible("i2se,duckbill") ||
+		 of_machine_is_compatible("i2se,duckbill-2"))
 		duckbill_init();
 	else if (of_machine_is_compatible("msr,m28cu3"))
 		m28cu3_init();