[maguro] Fixes for bluetooth, rild, audio and ducati firmware loading

1) Let the bcm firmware service not stall the boot process
2) Create symlinks to the mmcblk partitions in the right place
3) Remove invalid pulseaudio sink for bluetooth
4) Load RPMSG kernel modules in early boot for the ducati firmware to load
5) Work around ofono issues: get data, SMS and calling working (somehow)