[ Upstream commit c7fddbd5db5cffd10ed4d18efa20e36803d1899f ]

Add supports-cqe optional property for MMC hosts.

This property is used to identify the specific host controller
supporting command queue.
Signed-off-by: NSowjanya Komatineni <skomatineni@nvidia.com>
Reviewed-by: NThierry Reding <treding@nvidia.com>
Reviewed-by: NRob Herring <robh@kernel.org>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>
Signed-off-by: NSasha Levin <sashal@kernel.org>