tests: drivers: i2c_target_api: enable i2c_target_api test for RT1060

Enable RT1060 target API test for RT1060. The LPI2C does not support
dual controller/target operation, so LPI2C3 is used as the controller
while LPI2C1 implements the target device.

Signed-off-by: Daniel DeGrasse <daniel.degrasse@nxp.com>