Update adafruit_focaltouch.py

Support additional FT6236 chip id 0x36
Chip ID definitions:
FT6236 0x36    // FT6236 ID
FT6236U 0x64 // FT6236U ID

Author: mjwinney

adafruit_focaltouch.py

@@ -95,7 +95,7 @@ def __init__(self, i2c, address=_FT_DEFAULT_I2C_ADDR, debug=False, irq_pin=None)
             self.chip = "FT6206"
             self._touch_buffer_size = _FT6XXX_TOUCH_BUFFER_SIZE
             self._scale_factor = _FT6XXX_SCALE_FACTOR
-        elif chip_id == 0x64:
+        elif chip_id == 0x64 or chip_id == 0x36:
             self.chip = "FT6236"
             self._touch_buffer_size = _FT6XXX_TOUCH_BUFFER_SIZE
             self._scale_factor = _FT6XXX_SCALE_FACTOR