openEuler: introduced OPENEULER_LTS to identify LTS Release

openEuler inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I7761D


CVE: NA

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In most cases, the out-of-tree module needs to identify the release
version of the openEuler for interface adaptation. The existing
OPENEULER_VERSION() and OPENEULER_VERSION_CODE() cannot distinguish
between LTS versions and innovative versions. Therefore, a new macro
OPENEULER_LTS is introduced.

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