Overriding property getter and setters is not supported in Circuitpython

As reported on the forum: https://forums.adafruit.com/viewtopic.php?t=199790
Trying to use the LUT example results in:
```py
Lut: 27 deg C => 25.0% duty cycle
34 deg C => 50.0% duty cycle
42 deg C => 75.0% duty cycle
Traceback (most recent call last):
File "", line 45, in
File "adafruit_emc2101/emc2101_ext.py", line 230, in fan_speed
File "adafruit_emc2101/__init__.py", line 267, in fan_speed
File "adafruit_register/i2c_struct.py", line 80, in __get__
AttributeError: 'super' object has no attribute 'i2c_device'
```
Can anyone with the module test it on a Circuitpython board and confirm ?

I don't pretend to understand why it's that error, but when I did some tests I ended up noticing that in Circuitpython you can't override `@property` accessors from subclasses, which `emc2101_ext` and `emc2101_sub` do.

Here is where it does it for example:
https://github.com/adafruit/Adafruit_CircuitPython_EMC2101/blob/aea77f5a62ce099c99a35bfe7eae16676dc9fb8b/adafruit_emc2101/emc2101_ext.py#L223-L230

This works in C python, but not in Circuitpython.

```py
class Thing:
def __init__(self, i2c):
self.i2c_device = i2c
@property
def i2c(self):
print(self)
return self.i2c_device

class Thing_sub(Thing):
def __init__(self, i2c):
super().__init__(i2c)
@property
def i2c(self):
return super().i2c

c = Thing_sub("I2C")
print(c.i2c)
```
```
code.py output:
, >
Traceback (most recent call last):
File "code.py", line 17, in
File "code.py", line 14, in i2c
File "code.py", line 7, in i2c
AttributeError: 'super' object has no attribute 'i2c_device'
```
It's like super().i2c does call the i2c getter but with `self` being some `super` object that isn't what it should be ?
I don't know what a solution would be, maybe change the accessor methods to call a `_set_fan_speed()` method that could be overloaded in the sub classes, and called with super() as needed, since that form of overloading is known to work.

Reproduce the LUT example on a CircuitPython board, then inspect the overridden properties in adafruit_emc2101/emc2101_ext.py around lines 223-230 and the related emc2101_sub implementation. Read adafruit_register/i2c_struct.py around line 80 to understand the reported AttributeError. Done means the fan-speed accessors work on CircuitPython without the super/i2c_device failure.

Written by the indexing model from the issue text.