amdgpu: using vmalloc requires includeing vmalloc.h

Fixes: 240c811ccde4 ("drm/amdgpu: fix VRAM partially encroached issue in GDDR6 memory training(V2)")
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
1 file changed