drm/amdgpu: Add a missing tab

This tab was deleted accidentally and triggers a Smatch warning:

    drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c:1006 gfx_v8_0_init_microcode()
    warn: inconsistent indenting

Add it back.

Fixes: 0aaafb73 ("drm/amd: Use `amdgpu_ucode_*` helpers for GFX8")
Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>