When applying host config values like dtoverlay and dtparam, take values not starting with double quotes as single entries instead of arrays to parse

Signed-off-by: Pablo Carranza Velez <pablo@resin.io>

src/device-config.coffee

@@ -208,6 +208,9 @@ module.exports = class DeviceConfig
 			key.replace(configRegex(), '$2')
 		parsedEnv = _.mapValues parsedEnv, (val, key) ->
 			if _.includes(arrayConfigKeys, key)
+				if !_.startsWith(val, '"')
+					return [ val ]
+				else
 					return JSON.parse("[#{val}]")
 			else
 				return val