omap3_beagle: use omap3-beagle.dtb for the C4 revision

findftd is currently setting fdtfile to undefined for the beagle c4, select omap3-beagle.dtb instead

Signed-off-by: Robert Nelson <robertcnelson@gmail.com>
diff --git a/include/configs/omap3_beagle.h b/include/configs/omap3_beagle.h
index 1b566c0..c58bc91 100644
--- a/include/configs/omap3_beagle.h
+++ b/include/configs/omap3_beagle.h
@@ -241,6 +241,8 @@
 			"setenv fdtfile omap3-beagle.dtb; fi; " \
 		"if test $beaglerev = Cx; then " \
 			"setenv fdtfile omap3-beagle.dtb; fi; " \
+		"if test $beaglerev = C4; then " \
+			"setenv fdtfile omap3-beagle.dtb; fi; " \
 		"if test $beaglerev = xMAB; then " \
 			"setenv fdtfile omap3-beagle-xm.dtb; fi; " \
 		"if test $beaglerev = xMC; then " \