Use systick timer for RT1050 to provide better performance than low
frequency GPT timer
Performance change (as tested with iperf on RT1050)
TCP RX: 49.1Mbps->50.8Mbps
TCP TX: 40.8Mbps->46.2Mbps
Signed-off-by: Daniel DeGrasse <daniel.degrasse@nxp.com>
Daniel DeGrasse