drm/amd/display: Remove duplicate include of hubp.h

In commit 482812d5 ("drm/amd/display: Set max TTU on
DPG enable"), "hubp.h" was added which caused the duplicate include.
To be on the safe side, remove the later duplicate include.

Signed-off-by: Wan Jiabing <wanjiabing@vivo.com>
Reviewed-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>