This adds some basic unit tests for the new amdgpu driver.
v2: use common util_math.h
v3: implement suggestions from Emil
replace malloc/memset with calloc
make header guards all caps
use posix_memalign rather than mem_align
replace malloc with calloc for pm4 allocations
make CU_SuiteInfo static
fix Makefile.am
fix fd numbering
use drmGetVersion/drmFreeVersion rather than open coding it
close fd, clean up CU registry on error
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>