STM32.SDMMC: Use 512 for block address
STM32.SDMMC: Use 512 for block address

Info.Card_Block_Size is the internal flash block size so it shouldn't be
used to compute the block address.

AdaCore/Ada_Drivers_Library,simonjwright/Ada_Drivers_Library,Fabien-Chouteau/Ada_Drivers_Library,AdaCore/Ada_Drivers_Library,Fabien-Chouteau/Ada_Drivers_Library,simonjwright/Ada_Drivers_Library