i3c: master: Use unsigned int for dev_nack_retry_count consistently

i3c: master: Use unsigned int for dev_nack_retry_count consistently

Use unsigned int for dev_nack_retry_count across the core and
controller drivers to match the type of master->dev_nack_retry_count.

Update the sysfs store path to use kstrtouint() and adjust the
 ->set_dev_nack_retry() callback prototype and callers accordingly.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20260616113752.196140-4-adrian.hunter@intel.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>