clamp group physicalDeviceCount to VK_MAX_DEVICE_GROUP_SIZE

[aizu-m]

Tracing how driver-reported counts flow into the device-group sort.

out-of-bounds write, linux_sort_physical_device_groups (loader_linux.c:363):
    internal_device_info[gpu] = ...      gpu < group_props.physicalDeviceCount
    internal_device_info is [VK_MAX_DEVICE_GROUP_SIZE]   (32 entries)

VkPhysicalDeviceGroupProperties::physicalDevices is a fixed [VK_MAX_DEVICE_GROUP_SIZE] array, and loader_physical_device_group_term embeds a matching internal_device_info[VK_MAX_DEVICE_GROUP_SIZE]. terminator_EnumeratePhysicalDeviceGroups copies each group straight from the ICD into local_phys_dev_groups[...].group_props and trusts physicalDeviceCount unmodified.

An ICD that reports physicalDeviceCount greater than 32 then drives the consumers off the end of those fixed arrays: the Linux sort writes past internal_device_info, while the Windows sort and setup_loader_tramp_phys_dev_groups read past physicalDevices. The count from the first (group-count) query is already clamped, but the per-group device count never was.

Clamp it to VK_MAX_DEVICE_GROUP_SIZE at the two points where the group is copied in, so every downstream consumer sees a count that fits its array. The plain-device path already sets the count to 1.

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