patches/openwrt: Turris 1.x support patch: fix RTC compatible string

Reference: https://elixir.bootlin.com/linux/v4.14.262/source/drivers/rtc/rtc-ds1307.c#L309

Fixes: #208

patches/openwrt/wip/0002-Add-Turris-1.X-support-kernel-4.14.patch

@@ -378,7 +378,7 @@ index 0000000..b5128a3
 +
 +		i2c@3000 {
 +			rtc@6f {
-+				compatible = "mcp7940x";
++				compatible = "microchip,mcp7940x";
 +				reg = <0x6f>;
 +			};
 +			lm90@4c {