ports: Convert legacy uppercase macro names to lowercase.

ports/cc3200/hal/cc3200_hal.c

ports/cc3200/mods/modmachine.c

ports/cc3200/mods/moduos.c

ports/cc3200/mods/modwlan.c

ports/cc3200/mods/pybpin.c

ports/cc3200/mods/pybrtc.c

ports/esp32/modnetwork.c

ports/esp32/modsocket.c

ports/esp8266/modesp.c

ports/esp8266/modnetwork.c

ports/nrf/boards/microbit/modules/microbitdisplay.c

ports/nrf/boards/microbit/modules/microbitimage.c

ports/nrf/modules/machine/pin.c

ports/nrf/modules/machine/pwm.c

ports/nrf/modules/machine/rtcounter.c

ports/nrf/modules/machine/spi.c

ports/nrf/modules/machine/timer.c

ports/nrf/modules/music/modmusic.c

ports/nrf/modules/ubluepy/ubluepy_characteristic.c

ports/nrf/modules/ubluepy/ubluepy_peripheral.c