BLCU binary size uploading

[g0nz4I0]

This should be reviewed by firmware and specially @Cantonplas but it would be interesting to upload the binaries to the BLCU in maximum chunks of the equivalent sector size, this is 128kB.

However I believe TFTP already breaks everything into smaller chunks, that's why I'm quoting @Cantonplas to review this and further discuss this.

[Cantonplas]

Okay i want to add some info I found working on the blcu and with a tftp client. Basically every packet works this way:
-The client waits for ack, when the client recieves it then it sends a 512 byte packet
-The blcu sends ack
-It repeats and it should stop at 128kB because the blcu stops sending ack until it finishes sending the binary through can.

Basically if we ensure there isnt any data packet loss because of udp we should be all good, but to completely eliminate the risk of lossing data the best course of action is to split the binary in 131.072 bytes(if i recall correctly) so that we always ensure it stops at that size.