drm/tegra: Fix another missing include

Since Tegra now compile tests on other platforms the kernel test robot
started to complain that this here is not pulled in under all
conditions.
Signed-off-by: Christian König <christian.koenig@amd.com>
Reported-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/oe-kbuild-all/202304050946.yGGTKkcr-lkp@intel.com/Signed-off-by: Thierry Reding <treding@nvidia.com>

drivers/gpu/drm/tegra/fb.c

@@ -8,6 +8,7 @@
  */
 
 #include <linux/console.h>
+#include <linux/vmalloc.h>
 
 #include <drm/drm_fourcc.h>
 #include <drm/drm_framebuffer.h>