* config.sub: Add Broadcom SiByte SB-1 processor support
(mipsisa64sb1, mipsisa64sb1el). Add little-endian variants of
mipsisa32 and mipsisa64 (mipsisa32el and mipsisa64el,
respectively). Sort MIPS entries and split their lines a bit more
logically. Make sure that all of the MIPS entries in the "without
company name" target list are echoed in the "with company name"
list.