ext: hal: nxp: mcux: Fix ethernet timestamping driver
ext: hal: nxp: mcux: Fix ethernet timestamping driver

Fix timestamping in MCUX external library. The nanosecond part of the
frame timestamp wasn't saved.

Signed-off-by: Julien Chevrier <0d345f91ac7f9d9a652ea8240d45b3527bc7267e@intel.com>

explora26/zephyr,explora26/zephyr,finikorg/zephyr,punitvara/zephyr,ldts/zephyr,punitvara/zephyr,kraj/zephyr,Vudentz/zephyr,Vudentz/zephyr,punitvara/zephyr,kraj/zephyr,ldts/zephyr,GiulianoFranchetto/zephyr,GiulianoFranchetto/zephyr,Vudentz/zephyr,galak/zephyr,explora26/zephyr,kraj/zephyr,ldts/zephyr,nashif/zephyr,nashif/zephyr,GiulianoFranchetto/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,explora26/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,nashif/zephyr,Vudentz/zephyr,finikorg/zephyr,GiulianoFranchetto/zephyr,zephyrproject-rtos/zephyr,kraj/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,ldts/zephyr,GiulianoFranchetto/zephyr,punitvara/zephyr,ldts/zephyr,nashif/zephyr,punitvara/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,explora26/zephyr,finikorg/zephyr,kraj/zephyr,galak/zephyr,galak/zephyr,nashif/zephyr,Vudentz/zephyr