fix: enlarge kernel geoip size limit

[mzz2017]

Background

Problem:

RoutingMatcherBuilder.BuildKernspace: newLpmMap: update: no space left on device

Problem configuration:

group {
    premium {
        filter: name(tcp1,tcp2)
        policy: random
    }
    udp {
        filter: name(udp)
        policy: random
    }
    hktcp {
        filter: name(hktcp)
        policy: random
    }
    hkudp {
        filter: name(hkudp)
        policy: random
    }
}
routing {
    pname(NetworkManager) -> direct
    pname(DELETED) -> direct
    dip(DELETED) -> direct
    dip(geoip:private) -> direct
    dip(geoip:cn) -> direct
    domain(geosite:cn) -> direct
    dport(123) -> direct
    ipversion(6) -> direct
    dip(geoip:US) && l4proto(tcp) -> premium
    dip(geoip:US) && l4proto(udp) -> udp
    dip(geoip:CA) && l4proto(tcp) -> premium
    dip(geoip:CA) && l4proto(udp) -> udp
#    !dip(geoip:cn) && l4proto(udp) -> udp 
#    fallback: premium 
    !dip(geoip:cn) && l4proto(udp) -> hkudp 
    fallback: hktcp 
    }

Checklist

• The Pull Request has been fully tested

Full changelog

• Enlarge MAX_LPM_SIZE 100 times from 20480 to 2048000. It is acceptable because the map elements are lazily allocated.

[kunish]

simple enough