mmc: stm32_sdmmc2: correctly manage block size

DBLOCKSIZE should be filled such as the data size is 2^DBLOCKSIZE.
Hence it is calculated with __builtin_ctz.

Change-Id: Id6b5ff9b594afc4fc523a388011beed307e6abd1
Signed-off-by: Yann Gautier <yann.gautier@st.com>
1 file changed