Revert "dt-bindings: mmc: Add disable-cqe-dcmd property."

This reverts commit e4ba1578.

This is a preparation change for merging android-4.19-q.73 into
msm-4.19 branch.

[1] is conflicting against [2] in msm-4.19.

[1] e4ba1578("dt-bindings: mmc: Add disable-cqe-dcmd property.")
[2] 728aba9a("Documentation: devicetree: Remove devicetree bindings from kernel")

Change-Id: Id79777ab7b045d86ffda0d5ef9bcb4c99803a56c
Signed-off-by: Ivaylo Georgiev <irgeorgiev@codeaurora.org>