Move buildroot to bsp directory.

bsp/buildroot/package/json-c/Config.in

@@ -0,0 +1,13 @@
+config BR2_PACKAGE_JSON_C
+	bool "json-c"
+	# uses __sync_val_compare_and_swap_4
+	depends on BR2_TOOLCHAIN_HAS_SYNC_4
+	help
+	  JSON-C - A JSON implementation in C
+
+	  JSON-C implements a reference counting object model that
+	  allows you to easily construct JSON objects in C, output
+	  them as JSON formatted strings and parse JSON formatted
+	  strings back into the C representation of JSON objects.
+
+	  https://github.com/json-c/json-c/