ARM: ep93xx: ts72xx: Add support for BK3 board - ts72xx derivative

The BK3 board is a derivative of the ts72xx reference design.

Signed-off-by: Lukasz Majewski <lukma@denx.de>
Acked-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Alexander Sverdlin <alexander.sverdlin@gmail.com>

arch/arm/tools/mach-types

@@ -345,6 +345,7 @@ mxlads			MACH_MXLADS		MXLADS			1851
 linkstation_mini	MACH_LINKSTATION_MINI	LINKSTATION_MINI	1858
 afeb9260		MACH_AFEB9260		AFEB9260		1859
 imx27ipcam		MACH_IMX27IPCAM		IMX27IPCAM		1871
+bk3			MACH_BK3		BK3			1880
 rd88f6183ap_ge		MACH_RD88F6183AP_GE	RD88F6183AP_GE		1894
 realview_pba8		MACH_REALVIEW_PBA8	REALVIEW_PBA8		1897
 realview_pbx		MACH_REALVIEW_PBX	REALVIEW_PBX		1901