detect and setup solidrun hummingboard2

The hummingboard2 is slightly different to the cubox i and to the
hummingboard. The GPIO pin info to probe came from solidruns
for of u-boot on github.
https://github.com/SolidRun/u-boot-imx6/blob/imx6/board/solidrun/mx6_cubox-i/mx6_cubox-i.c#L569-L589
I have tested on a hummingboard-edge witha  imx6 solo and 512mb of
ram.

Signed-off-by: Dennis Gilmore <dgilmore@redhat.com>
diff --git a/include/configs/mx6cuboxi.h b/include/configs/mx6cuboxi.h
index 4e12de1..7fefe8e 100644
--- a/include/configs/mx6cuboxi.h
+++ b/include/configs/mx6cuboxi.h
@@ -106,6 +106,10 @@
 			"fi; "	\
 		"fi\0" \
 	"findfdt="\
+		"if test $board_name = HUMMINGBOARD2 && test $board_rev = MX6Q ; then " \
+			"setenv fdtfile imx6q-hummingboard2.dtb; fi; " \
+		"if test $board_name = HUMMINGBOARD2 && test $board_rev = MX6DL ; then " \
+			"setenv fdtfile imx6dl-hummingboard2.dtb; fi; " \
 		"if test $board_name = HUMMINGBOARD && test $board_rev = MX6Q ; then " \
 			"setenv fdtfile imx6q-hummingboard.dtb; fi; " \
 		"if test $board_name = HUMMINGBOARD && test $board_rev = MX6DL ; then " \