drivers/onewire/ds18x20.py: Add support for DS1822 sensor.

DS1822P sensors behave just like the DS18B20 except for the following:
- it has a different family code: 0x22
- it has only the GND and DQ pins connected, it uses parasitic power from
  the data line

Contributed by @nebelgrau77.

drivers/onewire/ds18x20.py

@@ -13,7 +13,7 @@ class DS18X20:
         self.buf = bytearray(9)
 
     def scan(self):
-        return [rom for rom in self.ow.scan() if rom[0] == 0x10 or rom[0] == 0x28]
+        return [rom for rom in self.ow.scan() if rom[0] in (0x10, 0x22, 0x28)]
 
     def convert_temp(self):
         self.ow.reset(True)