mmc: atmel_mci: using IP version for different setting

Using IP version for different setting
  - Higher version supports 8bit mode
  - Higher version bus width setting is different

Signed-off-by: Bo Shen <voice.shen@atmel.com>
mmc: atmel_mci: add mmc card support

add mmc card support with atmel mci driver

Signed-off-by: Bo Shen <voice.shen@atmel.com>