scripts: kconfig: Add config fragment support in board/../

Add support to config fragments (.config) located in the /board
directory. This will allow only base defconfigs to live in /configs and
all fragments to live in their respective device directory in /board/..

Signed-off-by: Jason Kacines <j-kacines@ti.com>
diff --git a/scripts/kconfig/Makefile b/scripts/kconfig/Makefile
index 12e525e..2d97aab 100644
--- a/scripts/kconfig/Makefile
+++ b/scripts/kconfig/Makefile
@@ -99,7 +99,9 @@
 %_config: %_defconfig
 	@:
 
-configfiles=$(wildcard $(srctree)/kernel/configs/$@ $(srctree)/arch/$(SRCARCH)/configs/$@)
+configfiles=$(wildcard $(srctree)/kernel/configs/$@ \
+		$(srctree)/arch/$(SRCARCH)/configs/$@ \
+		$(shell find $(srctree)/board -name "$@"))
 
 %.config: $(obj)/conf
 	$(if $(call configfiles),, $(error No configuration exists for this target on this architecture))