commit f258b44e upstream.

This patch supports a spi mode setup and bit order setup by IO control.
    spi mode:     mode 0 to mode 3
    bit order:    LSB first, MSB first
Signed-off-by: Tomoya MORINAGA <tomoya.rohm@gmail.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>