targets:clock: Update the coreclock value

Update the coreclock value which will be used in middleware

Signed-off-by: timwang <tim.wang@nxp.com>

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

@@ -467,5 +467,5 @@ void BOARD_BootClockRUN(void)
     /* Set GPT2 High frequency reference clock source. */
     IOMUXC_GPR->GPR5 &= ~IOMUXC_GPR_GPR5_VREF_1M_CLK_GPT2_MASK;
     /* Set SystemCoreClock variable. */
-    SystemCoreClock = BOARD_BOOTCLOCKRUN_CORE_CLOCK;
+    SystemCoreClock = CLOCK_GetCpuClkFreq();
 }