Dma capable of broadcasting

[davideschiavone]

The DMA currently can implement to modes:

1. normal mode

for(... i<N ....) dst[i] = src[i]

2. address mode

for(... i<N ....) dst[i] = src[ addr[i] ]

We want to add a broadcast mode

3. broadcast mode

for(... i<N ....) dst_1[i] = src[i] dst_2[i] = src[i]

the user should be able to select which are the destinations via some sort of MASKING. Destinations and source can be either SLOTS or MEMORIES

@grinningmosfet