Revert "dt-bindings: arm: qcom: Document SDX65 platform and boards"

This reverts commit 3b338c9a.

This was a duplicate of 61339f36,
causing the sdx65 compatible and its board to be documented twice.

Signed-off-by: Stanislav Jakubek <stano.jakubek@gmail.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20211223173339.GA3925@standask-GA-A55M-S2HP