drm/ast: Call open_key before enable_mmio in POST code
open_key enables access the registers used by enable_mmio Signed-off-by: NY.C. Chen <yc_chen@aspeedtech.com> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org> Acked-by: NJoel Stanley <joel@jms.id.au> Tested-by: NY.C. Chen <yc_chen@aspeedtech.com> Cc: <stable@vger.kernel.org> Signed-off-by: NDave Airlie <airlied@redhat.com>
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