This adds the final missing part to full CBCH support:
* keep a tab on the current queue length for basic + extended CBCH
* keep rate counters about the number of sent / transmitted SMSCB
* send CBCH LOAD information via RSL to the BSC
Change-Id: I7068c7937a60a900c40439115bb84dc3ee0d061f
The logic for Extended CBCH are the same as for the Basic CBCH, we just
need to
* duplicate our related state
* parse the optional RSL_IE_SMSCB_CHAN_INDICATOR IE
* start to send data on the Extended CBCH (TB=4..7)
Change-Id: If2c6dc7da1e2185ab75fc957f8d305ad8db22429
Closes: OS#3535
Pau Espin
Harald Welte