This reverts commit 2cfe34e18970d26bff73c63f16c76dae22138d19.
Enable AGP aperture cause SDMA page fault for gfx11.0.2,
so temp disable AGP aperture until SDMA FW resolved this.
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com> Signed-off-by: Jack Gui <Jack.Gui@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>