gallium/radeon: add HUD queries for GPU temperature and clocks

gallium/radeon: add HUD queries for GPU temperature and clocks

Only the Radeon kernel driver exposed the GPU temperature and
the shader/memory clocks, this implements the same functionality
for the AMDGPU kernel driver.

These queries will return 0 if the DRM version is less than 3.10,
I don't explicitely check the version here because the query
codepath is already a bit messy.

v2: - rebase on top of master

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>