MXRT1050: Do not switch 24M source to reduce latency

Signed-off-by: Mahesh Mahadevan <mahesh.mahadevan@nxp.com>

Author: mmahadevan108

targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_MIMXRT1050/TARGET_EVK/specific.c

@@ -134,7 +134,7 @@ void ClockSetToOverDriveRun(void)
     LPM_EnterCritical();
     SwitchSystemClocks(LPM_PowerModeLowPowerRun);
     LPM_ExitCritical();
-    ClockSelectXtalOsc();
+    //ClockSelectXtalOsc();
 
     /* Init ARM PLL */
     CLOCK_SetDiv(kCLOCK_ArmDiv, 1);
@@ -428,7 +428,7 @@ void ClockSetToLowPowerIdle(void)
     LPM_EnterCritical();
     SwitchSystemClocks(LPM_PowerModeLowPowerRun);
     LPM_ExitCritical();
-    ClockSelectRcOsc();
+    //ClockSelectRcOsc();
 
     /* Deinit ARM PLL */
     CLOCK_DeinitArmPll();