drivers: syscon: support mcxa156 i3c clock in syscon driver

Add mcxa156 i3c clock support

Signed-off-by: Neil Chen <[email protected]>

Author: NeilChen93

drivers/clock_control/clock_control_mcux_syscon.c

@@ -374,6 +374,8 @@ static int mcux_lpc_syscon_clock_control_get_subsys_rate(const struct device *de
 	case MCUX_I3C_CLK:
 #if CONFIG_SOC_SERIES_MCXN
 		*rate = CLOCK_GetI3cClkFreq(0);
+#elif CONFIG_SOC_SERIES_MCXA
+		*rate = CLOCK_GetI3CFClkFreq();
 #else
 		*rate = CLOCK_GetI3cClkFreq();
 #endif