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This adds a new device management unit in the common code responsible for facilitating the parsing of the GPU top device list and providing that info to other units in nvgpu. The basic idea is to read this list once from HW and store it in a set of lists corresponding to each device type (graphics, LCE, etc). Many of the HALs in top can be deleted and instead implemented using common code parsing the SW representation. Every time the driver queries the device list it does so using a device type and instance ID. This is common code. The HAL is responsible for populating the device list in such a way that the driver can query it in a chip agnostic manner. Also delete some of the unit tests for functions that no longer exist. This code will require new unit tests in time; those should be quite simple to write once unit testing is needed. JIRA NVGPU-5421 Change-Id: Ie41cd255404b90ae0376098a2d6e9f9abdd3f5ea Signed-off-by: Alex Waterman <alexw@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2319649 Tested-by: mobile promotions <svcmobile_promotions@nvidia.com> Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>