drm/amd/amdgpu/amdgpu_device: Make local function static

Fixes the following W=1 kernel build warning(s):

 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c:4624:6: warning: no previous prototype for ‘amdgpu_device_recheck_guilty_jobs’ [-Wmissing-prototypes]

Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: "Christian König" <christian.koenig@amd.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: amd-gfx@lists.freedesktop.org
Cc: dri-devel@lists.freedesktop.org
Cc: linux-media@vger.kernel.org
Cc: linaro-mm-sig@lists.linaro.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -4635,7 +4635,7 @@ static int amdgpu_device_suspend_display_audio(struct amdgpu_device *adev)
 	return 0;
 }
 
-void amdgpu_device_recheck_guilty_jobs(
+static void amdgpu_device_recheck_guilty_jobs(
 	struct amdgpu_device *adev, struct list_head *device_list_handle,
 	struct amdgpu_reset_context *reset_context)
 {