Move post_rcs_wait into struct imx_wdt_hw_feature to simple code logic for
difference compatible string.
i.MX93 watchdog needn't wait 2.5 clocks after RCS is done. So needn't set
post_rcs_wait.
Signed-off-by: Alice Guo <alice.guo@xxxxxxx>
Reviewed-by: Ye Li <ye.li@xxxxxxx>
Signed-off-by: Frank Li <Frank.Li@xxxxxxx>