drm/tegra: gem: Use more consistent data types

Use size_t consistently for sizes and u32/u64 instead of uint32_t and
uint64_t.

Signed-off-by: Thierry Reding <treding@nvidia.com>

diff --cc drivers/gpu/drm/tegra/gem.c
Simple merge

diff --cc drivers/gpu/drm/tegra/gem.h
Simple merge