MCXN947: drivers: fsl_clock.c: Fix WWDT Sel Bug

The case statement for selecting the WDT1
clock sel is missing a possible case
that selects 1MHZ.

Signed-off-by: Emilio Benavente <emilio.benavente@nxp.com>

Author: EmilioCBen

mcux/README

@@ -78,3 +78,4 @@ Patch List:
   11. devices: LPC5536: Changed FSL_FEATURE_PWM_HAS_NO_WAITEN from 1 to 0 to solve pwm issue.
   12. devices: LPC55S36: Changed FSL_FEATURE_PWM_HAS_NO_WAITEN from 1 to 0 to solve pwm issue.
   13. devices: MIMX8UD7: add definition for LPUART_RX_TX_IRQS
+  14. devices: MCXN947: clock: Updated the clock frequency, case 3 on GetWdtClkFreq returns 1MHZ

mcux/mcux-sdk/devices/MCXN947/drivers/fsl_clock.c

@@ -1734,6 +1734,9 @@ uint32_t CLOCK_GetWdtClkFreq(uint32_t id)
             case 2U:
                 freq = CLOCK_GetClk1MFreq();
                 break;
+            case 3U:
+                freq = CLOCK_GetClk1MFreq();
+                break;
             default:
                 freq = 0U;
                 break;