lz4hc: fixed PA / SC parameter order
lz4hc: fixed PA / SC parameter order

also :
reserved PA for levels 9+ (instead of 8+).
In most cases, speed is lower, and compression benefit is not worth.

unknownbrackets/maxcso,unknownbrackets/maxcso,unknownbrackets/maxcso,unknownbrackets/maxcso,unknownbrackets/maxcso,unknownbrackets/maxcso,unknownbrackets/maxcso