【OLK-5.10】不加CONFIG_IMA_DIGEST_LIST选项时编译内核报错

【标题描述】不加CONFIG_IMA_DIGEST_LIST选项时编译内核报错
【环境信息】
任何内核编译环境
【问题复现步骤】
编译内核，不加CONFIG_IMA_DIGEST_LIST编译选项，必现
【预期结果】
编译成功
【实际结果】
编译报错，ima_digest_db_max_size变量未定义
【附件信息】
```
security/integrity/ima/ima_fs.c: In function ‘ima_read_file’:
security/integrity/ima/ima_fs.c:325:15: error: ‘ima_digest_db_max_size’ undeclared (first use in this function); did you mean ‘ima_digest_is_immutable’?
        size > ima_digest_db_max_size - ima_digest_db_size) {
               ^~~~~~~~~~~~~~~~~~~~~~
               ima_digest_is_immutable
security/integrity/ima/ima_fs.c:325:15: note: each undeclared identifier is reported only once for each function it appears in
security/integrity/ima/ima_fs.c:325:40: error: ‘ima_digest_db_size’ undeclared (first use in this function); did you mean ‘ima_digest_data’?
        size > ima_digest_db_max_size - ima_digest_db_size) {
                                        ^~~~~~~~~~~~~~~~~~
                                        ima_digest_data
make[3]: *** [scripts/Makefile.build:279: security/integrity/ima/ima_fs.o] Error 1
make[3]: *** Waiting for unfinished jobs....
make[2]: *** [scripts/Makefile.build:496: security/integrity/ima] Error 2
make[1]: *** [scripts/Makefile.build:496: security/integrity] Error 2
make: *** [Makefile:1821: security] Error 2
make: *** Waiting for unfinished jobs...
```

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