tu: Clear unused fields in GetPhysicalDeviceMemoryProperties2
The CTS compares the result of GetPhysicalDeviceMemoryProperties and the 2 version with a straight memcmp, and since there are unused heaps and types we didn't initialize it complained.
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The CTS compares the result of GetPhysicalDeviceMemoryProperties and the 2 version with a straight memcmp, and since there are unused heaps and types we didn't initialize it complained.