Added block length setup in SdioSpi.
Fixed block read in SdioSpi driver.
Simplified interrupt handler in SdioSpi driver.
Simplified state changing in SdioSpi.
Restored initial functionality of SdioSpi driver.
Fixed coding style in SdioSpi driver.
Changes in busy waiting in SdioSpi driver.
Added auto stop for block read in SdioSpi.
Added optional interrupt reduction in SdioSpi.
Added optional timer to reduce interrupt request rate before block read
and after block write operations.
Updated list of the interface options.
Minor updates in SdioSpi.
Renamed pointer to the SPI bus object.
Added baud rate configuration.
Added baud rate configuration to SdCard driver.