i3c: master: cdns: fix I2C transfers in Cadence I3C master driver

This patch fixes I2C transfers in Cadence I3C master driver.
There was no way to queue more than one I2C transfer before.

Fixes: 603f2bee ("i3c: master: Add driver for Cadence IP")
Signed-off-by: Przemyslaw Gaj <pgaj@cadence.com>
Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>