According to https://learn.microsoft.com/en-us/windows-hardware/drivers/bringup/other-acpi-namespace-objects
some USB Imaging device has corresponding ACPI device object with _PLD(physical location of device) information for
each camera interface to inform camera position.
This will expose two information to userland with sysctl:
- rawpld raw content of _PLD object.
- acpi_handle ACPI namespace path of Device object corresponding to camera interface.
Note that set KERNBUILDDIR to build dir of kernel with ACPI enabled to make this patch take effect.