mmc: mmci: Add support for sdmmc variant revision 2.0

This patch adds a sdmmc variant revision 2.0. This revision is backward
compatible with 1.1, but adds DMA linked list support.

Signed-off-by: Ludovic Barre <ludovic.barre@st.com>
Link: https://lore.kernel.org/r/20200128090636.13689-10-ludovic.barre@st.com


Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>