amdgpu: using vmalloc requires includeing vmalloc.h

Fixes: 240c811c ("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>

drivers/gpu/drm/amd/amdgpu/psp_v11_0.c

@@ -22,6 +22,7 @@
 
 #include <linux/firmware.h>
 #include <linux/module.h>
+#include <linux/vmalloc.h>
 
 #include "amdgpu.h"
 #include "amdgpu_psp.h"