mimxrt1050_evk: Fix kernel timer frequency

The kernel timer frequency was incorrectly set to the system clock
frequency (528 MHz) instead of the core clock frequency (600 MHz).

Signed-off-by: Maureen Helm <[email protected]>

Author: MaureenHelm

boards/arm/mimxrt1050_evk/doc/mimxrt1050_evk.rst

@@ -126,7 +126,7 @@ System Clock
 ============
 
 The MIMXRT1050 SoC is configured to use the 24 MHz external oscillator on the
-board with the on-chip PLL to generate a 528 MHz system clock.
+board with the on-chip PLL to generate a 600 MHz core clock.
 
 Serial Port
 ===========

boards/arm/mimxrt1050_evk/mimxrt1050_evk_defconfig

@@ -13,6 +13,6 @@ CONFIG_UART_CONSOLE=y
 CONFIG_SERIAL=y
 CONFIG_CORTEX_M_SYSTICK=y
 CONFIG_GPIO=y
-CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC=528000000
+CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC=600000000
 CONFIG_OSC_EXTERNAL=y
 CONFIG_ARM_MPU_IMX_RT=y