use SBN defines for the size of arrays

[CDKnightNASA]

See nasa/cFE#899 (review) -- would be good to have SBN defines for array sizes (which can be based on CFE/OSAL defines, surely.)

[jphickey]

I wouldn't expect SBN to have its own defines - the reason the MISSION scope defines exist is so every CPU will share the same definition of the message regardless of its internal/local config - so the binary format will be the same (maybe).

As long as SBN sticks to mission-scope defs for its I/O then you are fine. Other apps passing thru SBN already should be.