cpu: mips32r2_common: Use stdio_uart to handle UHI write syscalls
cpu: mips32r2_common: Use stdio_uart to handle UHI write syscalls

Signed-off-by: Francois Berder <880c5b95aa239388d35adb184ba52ce6e74e78eb@users.noreply.github.com>

OlegHahm/RIOT,miri64/RIOT,x3ro/RIOT,OTAkeys/RIOT,smlng/RIOT,ant9000/RIOT,ant9000/RIOT,jasonatran/RIOT,authmillenon/RIOT,OTAkeys/RIOT,jasonatran/RIOT,kYc0o/RIOT,ant9000/RIOT,smlng/RIOT,mtausig/RIOT,miri64/RIOT,josephnoir/RIOT,jasonatran/RIOT,x3ro/RIOT,smlng/RIOT,aeneby/RIOT,yogo1212/RIOT,rfuentess/RIOT,authmillenon/RIOT,RIOT-OS/RIOT,basilfx/RIOT,OlegHahm/RIOT,mtausig/RIOT,josephnoir/RIOT,toonst/RIOT,kYc0o/RIOT,kaspar030/RIOT,basilfx/RIOT,authmillenon/RIOT,smlng/RIOT,basilfx/RIOT,miri64/RIOT,kYc0o/RIOT,aeneby/RIOT,kYc0o/RIOT,josephnoir/RIOT,OlegHahm/RIOT,x3ro/RIOT,aeneby/RIOT,miri64/RIOT,kaspar030/RIOT,OTAkeys/RIOT,toonst/RIOT,RIOT-OS/RIOT,kaspar030/RIOT,basilfx/RIOT,josephnoir/RIOT,authmillenon/RIOT,mtausig/RIOT,rfuentess/RIOT,yogo1212/RIOT,yogo1212/RIOT,rfuentess/RIOT,mtausig/RIOT,OTAkeys/RIOT,mtausig/RIOT,rfuentess/RIOT,jasonatran/RIOT,basilfx/RIOT,authmillenon/RIOT,toonst/RIOT,josephnoir/RIOT,toonst/RIOT,authmillenon/RIOT,aeneby/RIOT,OTAkeys/RIOT,yogo1212/RIOT,ant9000/RIOT,OlegHahm/RIOT,smlng/RIOT,kaspar030/RIOT,RIOT-OS/RIOT,yogo1212/RIOT,x3ro/RIOT,rfuentess/RIOT,RIOT-OS/RIOT,yogo1212/RIOT,x3ro/RIOT,kYc0o/RIOT,ant9000/RIOT,kaspar030/RIOT,jasonatran/RIOT,OlegHahm/RIOT,miri64/RIOT,RIOT-OS/RIOT,toonst/RIOT,aeneby/RIOT