soc: arm: nxp: rt595: Attached clock freq to pmic
soc: arm: nxp: rt595: Attached clock freq to pmic

Attached the correct clock frequency for
FlexComm15 which connects to the PMIC_I2C peripheral

Signed-off-by: Emilio Benavente <10c81cd03a1daae78f77b3a3b46301ccbf8eb663@nxp.com>

galak/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,galak/zephyr,finikorg/zephyr,galak/zephyr,finikorg/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,galak/zephyr