target/loongarch: Skip global TLB when calculating replaced TLB

target/loongarch: Skip global TLB when calculating replaced TLB

When new TLB entry is added, TLB index is calculated from invalid
entry at first and then from different ASID, and randomly at last.

With different ASID, global TLB should be skipped since ASID is not
useful when global TLB is added.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Reviewed-by: Song Gao <gaosong@loongson.cn>