Currently spi geni driver supports only master mode operation.

Add spi device mode support to GENI based QuPv3.
Signed-off-by: Praveen Talari <quic_ptalari@quicinc.com>
Reviewed-by: Vijaya Krishna Nivarthi <quic_vnivarth@quicinc.com>
Link: https://lore.kernel.org/r/20230714042203.14251-3-quic_ptalari@quicinc.comSigned-off-by: Mark Brown <broonie@kernel.org>