regmap: i3c: switch to use i3c_xfer from i3c_priv_xfer

regmap: i3c: switch to use i3c_xfer from i3c_priv_xfer

Switch to use i3c_xfer instead of i3c_priv_xfer because framework will
update to support HDR mode. i3c_priv_xfer is now an alias of i3c_xfer.

Replace i3c_device_do_priv_xfers() with i3c_device_do_xfers(..., I3C_SDR)
to align with the new API.

Prepare for removal of i3c_priv_xfer and i3c_device_do_priv_xfers().

Signed-off-by: Frank Li <Frank.Li@nxp.com>
Acked-by: Mark Brown <broonie@kernel.org>
Link: https://patch.msgid.link/20251028-lm75-v1-3-9bf88989c49c@nxp.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>