Disambiguate UpdateTileMappings function usage

[hadalhw17]

• According to official docs(https://learn.microsoft.com/en-us/windows/win32/api/d3d12/nf-d3d12-id3d12commandqueue-updatetilemappings?redirectedfrom=MSDN), UpdateTileMappings is only taking a pointer to a single heap(allowing multiple offsets into this heap, but not multiple heaps). The sample is iterating over multiple heaps and tries to map tiles to them in a single UpdateTileMappings call. While this doesn't break the functionality of the sample, in a real world applications with more complicated heap usage patterns, this wouldn't work.

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[hadalhw17]

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