dt-bindings: mmc: controller: remove '|' when not needed

Adding "|" is used to keep the description format, remove it when
not needed after the split into mmc-controller.yaml and
mmc-controller-common.yaml files.

Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Message-ID: <20241128-topic-amlogic-arm32-upstream-bindings-fixes-convert-meson-mx-sdio-v4-3-11d9f9200a59@linaro.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>