Add support for Mac m1/m2 chips in MMS for TTS example

[yrik]

What does this PR do?

Adds support for m1/m2 chips for MMS TTS example

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[chevalierNoir]

Thanks @yrik ! Could you also add a few extra lines for non-m1/m2 CPU support like the following?

if torch.cuda.is_available():
    torch_device = torch.device("cuda")
elif torch.backends.mps.is_available() and torch.backends.mps.is_built():
    torch_device = torch.device("mps")
else:
    torch_device = torch.device("cpu")

[chevalierNoir]

CPU inference is added now. See this PR. The m1/m2 chip inference was not added to accomodate non-mac pytorch versions.