tests: drivers: counter_basic_api: Enable lptmr test for mimxrt1180_evk

The lptmr0 has been enabled with default settings defined in
dts/arm/nxp/nxp_rt118x.dtsi. Enable lptmr3 to test with
designated prescaler.

Signed-off-by: Felix Wang <fei.wang_3@nxp.com>
1 file changed