cpu: mips_pic32mx: Define CPU_ARCH and CPU_FAM
cpu: mips_pic32mx: Define CPU_ARCH and CPU_FAM

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

kYc0o/RIOT,ant9000/RIOT,kYc0o/RIOT,RIOT-OS/RIOT,authmillenon/RIOT,OTAkeys/RIOT,kaspar030/RIOT,RIOT-OS/RIOT,authmillenon/RIOT,OTAkeys/RIOT,kYc0o/RIOT,yogo1212/RIOT,miri64/RIOT,OlegHahm/RIOT,basilfx/RIOT,miri64/RIOT,OlegHahm/RIOT,kaspar030/RIOT,yogo1212/RIOT,authmillenon/RIOT,yogo1212/RIOT,jasonatran/RIOT,OlegHahm/RIOT,jasonatran/RIOT,OTAkeys/RIOT,ant9000/RIOT,kaspar030/RIOT,OTAkeys/RIOT,authmillenon/RIOT,jasonatran/RIOT,kaspar030/RIOT,jasonatran/RIOT,RIOT-OS/RIOT,OlegHahm/RIOT,RIOT-OS/RIOT,miri64/RIOT,authmillenon/RIOT,basilfx/RIOT,kYc0o/RIOT,yogo1212/RIOT,jasonatran/RIOT,yogo1212/RIOT,basilfx/RIOT,ant9000/RIOT,RIOT-OS/RIOT,authmillenon/RIOT,ant9000/RIOT,OTAkeys/RIOT,miri64/RIOT,yogo1212/RIOT,miri64/RIOT,basilfx/RIOT,basilfx/RIOT,ant9000/RIOT,OlegHahm/RIOT,kaspar030/RIOT,kYc0o/RIOT