tests-mbed_hal_fpga_ci_test_shield-uart: fix include order
tests-mbed_hal_fpga_ci_test_shield-uart: fix include order

mbedmicro/mbed,kjbracey-arm/mbed,mbedmicro/mbed,mbedmicro/mbed,kjbracey-arm/mbed,kjbracey-arm/mbed,mbedmicro/mbed,mbedmicro/mbed,kjbracey-arm/mbed