kernel: update SP2 OPENEULER_MINOR value to 2

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/I796HQ



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The version information OPENEULER_MINOR is not right in SP2,
update it's value to 2.

Signed-off-by: Jialin Zhang <zhangjialin11@huawei.com>