drm/amdgpu: fix warning about missing imu prototype

for imu_v11_0_3_program_rlc_ram(). Include imu_v11_0_3.h
in imu_v11_0_3.c.
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/imu_v11_0_3.c

@@ -22,6 +22,7 @@
  */
 #include "amdgpu.h"
 #include "amdgpu_imu.h"
+#include "imu_v11_0_3.h"
 
 #include "gc/gc_11_0_3_offset.h"
 #include "gc/gc_11_0_3_sh_mask.h"