refactor(stm32_sdmmc2): use DT helpers

Use dt_match_instance_by_compatible() and dt_fill_device_info()
functions to simplify SDMMC driver code.

Change-Id: Id16aa849ac79a9d3c2dc72c947fe189743856292
Signed-off-by: Yann Gautier <yann.gautier@foss.st.com>
1 file changed