soc: nxp: imxrt: imxrt118x: Enable GPT1/2 clock

dts: arm: nxp: mimxrt1180_evk: add GPT1/2 instance into devicetree

Enable GPT1/2 clock
Add GPT1/GPT2 instances
Set GPT2 as a counter, the default frequency is 240000000

Signed-off-by: Lucien Zhao <lucien.zhao@nxp.com>