Conditionally compile debug_kmem.c in the Makefile since the entire
file is not needed when CONFIG_NVGPU_TRACK_KMEM_USAGE is not enabled.
Removing as many conditional compilation flags from the C code itself
is highly desirable from a code complexity standard.
Change-Id: If1e87986ca1ee6d71485f1ab40f10c1645c1a628
Signed-off-by: Alex Waterman <alexw@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1576543
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>