Summary:
## Description

This pull request solves #74036

## How Functionality Changes Were Tested

Running:
```
from torch import nn

class A:
    def __init__(self):
        super().__init__()
        self.a = True

class B(A, nn.Module):
    def __init__(self):
        super().__init__()
        self.b = True

class C(nn.Module, A):
    def __init__(self):
        super().__init__()
        self.c = True

b = B()
c = C()

print(b.b)
print(b.a)

print(c.c)
print(c.a)
```

- ### Results - Before:
  ```
  >>> from torch import nn
  >>>
  >>>
  >>> class A:
  ...     def __init__(self):
  ...         super().__init__()
  ...         self.a = True
  ...
  >>>
  >>> class B(A, nn.Module):
  ...     def __init__(self):
  ...         super().__init__()
  ...         self.b = True
  ...
  >>>
  >>> class C(nn.Module, A):
  ...     def __init__(self):
  ...         super().__init__()
  ...         self.c = True
  ...
  >>>
  >>> b = B()
  >>> c = C()
  >>>
  >>> print(b.b)
  True
  >>> print(b.a)
  True
  >>>
  >>> print(c.c)
  True
  >>> print(c.a)
  Traceback (most recent call last):
    File "<stdin>", line 1, in <module>
    File "/pytorch/torch/nn/modules/module.py", line 1188, in __getattr__
      raise AttributeError("'{}' object has no attribute '{}'".format(
  AttributeError: 'C' object has no attribute 'a'
  ```

- ### Results - After:
  ```
  >>> from torch import nn
  >>>
  >>>
  >>> class A:
  ...     def __init__(self):
  ...         super().__init__()
  ...         self.a = True
  ...
  >>>
  >>> class B(A, nn.Module):
  ...     def __init__(self):
  ...         super().__init__()
  ...         self.b = True
  ...
  >>>
  >>> class C(nn.Module, A):
  ...     def __init__(self):
  ...         super().__init__()
  ...         self.c = True
  ...
  >>>
  >>> b = B()
  >>> c = C()
  >>>
  >>> print(b.b)
  True
  >>> print(b.a)
  True
  >>>
  >>> print(c.c)
  True
  >>> print(c.a)
  True
  ```

Pull Request resolved: #74096
Approved by: https://github.com/albanD

Test Plan: contbuild & OSS CI, see https://hud.pytorch.org/commit/pytorch/pytorch/1ac519e6b5f53c02f78d9bae26411affd49328af

Reviewed By: seemethere

Differential Revision: D34822179

fbshipit-source-id: 54741d983477f8655348b1b7991e8ddcdbc879f4