Make exp5438 radio modular
Set exp5438 default CPU frequency to 16MHz
Fix TrxEB leds order
Clean up exp5438 uart1 configuration
Add require LPM mode for exp5438
Add UART Rx DMA for exp5438
Add slip-radio mode to exp5438
Fix exp5438 uart configuration
Use RADIO_DEVICE in slip-radio
Use RADIO_DEVICE in exp5438 main
Use RADIO_DEVICE in slip-radio makefile
Adapt exp5438 platform-conf.h
Fix wrong usage of RADIO_DEVICE macro
Fix inversion in if-up/if-down trace
No input function is not an error
Fix sky-websense compilation issue