i3c: master: switch to use new callback .i3c_xfers() from .priv_xfers()

i3c: master: switch to use new callback .i3c_xfers() from .priv_xfers()

Switch to use the new .i3c_xfers() callback, which supports all I3C
transfer modes (SDR and HDR). Also replace struct i3c_priv_xfer with the
new struct i3c_xfer, as i3c_priv_xfer is now an alias of i3c_xfer.

No functional changes.

Signed-off-by: Frank Li <Frank.Li@nxp.com>
Tested-by: Tommaso Merciai <tommaso.merciai.xr@bp.renesas.com>
Link: https://patch.msgid.link/20251203-i3c_xfer_cleanup_master-v2-1-7dd94d04ee2d@nxp.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>