sw64: bpf: optimize DIV and MOD instructions

Sunway inclusion
category: performance
bugzilla: https://gitee.com/openeuler/kernel/issues/I73OCY



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Instead of calling helper functions at runtime, use linker to find the
symbols we need and use them directly to reduce overhead.

Signed-off-by: Mao Minkai <maominkai@wxiat.com>
Reviewed-by: He Sheng <hesheng@wxiat.com>
Signed-off-by: Gu Zitao <guzitao@wxiat.com>