Helios4: add fancontrol package and switch to .conf

Author: igorpecovnik

config/boards/helios4.csc renamed to config/boards/helios4.conf

@@ -10,3 +10,7 @@ HAS_VIDEO_OUTPUT="no"
 FORCE_BOOTSCRIPT_UPDATE="yes"
 KERNEL_TARGET="current,edge"
 KERNEL_TEST_TARGET="current"
+
+function post_family_config__helios4_extra_packages() {
+	add_packages_to_image "fancontrol"
+}