Bump trim bitvector to 64 KB to cover 64 GB
Bump trim bitvector to 64 KB to cover 64 GB

This seems like a very moddest bump in memory requirements to support
remembering the current trim status for a pretty decent sized
eMMC/SDCard/etc. memory.

fhunleth/fwup,fhunleth/fwup,michaelkschmidt/fwup,michaelkschmidt/fwup,michaelkschmidt/fwup,fhunleth/fwup