i3c: renesas: Add suspend/resume support

i3c: renesas: Add suspend/resume support

The Renesas I3C controller does not retain its register state across system
suspend, requiring the driver to explicitly save and restore hardware
configuration.

Add suspend and resume NOIRQ callbacks to handle system sleep transitions.

During suspend, save the Device Address Table (DAT) entries, assert reset
lines, and disable all related clocks to allow the controller to enter a
low-power state.

On resume, re-enable clocks and reset lines in the proper order. Restore
the REFCKCTL register, master dynamic address, and all DAT entries, then
reinitialize the controller.

Store the REFCLK divider value, and the master dynamic address to restore
timing and addressing configuration after resume.

Reviewed-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Tommaso Merciai <tommaso.merciai.xr@bp.renesas.com>
Link: https://patch.msgid.link/c469ef89e0156d37746a85bfc314232847d1185a.1767781092.git.tommaso.merciai.xr@bp.renesas.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>