loongarch架构上grub提供信息缺失

### loongarch架构修改之前的情况

```
[root@97dc939c6179 ~]# uname -a
Linux 97dc939c6179 6.6.25-2.1.an23.loongarch64 #1 SMP Thu May 23 22:32:01 CST 2024 loongarch64 loongarch64 loongarch64 GNU/Linux
[root@97dc939c6179 ~]# dnf provides grub2
Error: No matches found. If searching for a file, try specifying the full path or using a wildcard prefix ("*/") at the beginning.
```

### 对比其他架构的情况：

```
[huangyang@aarch64-15 ~]$ uname -a
Linux aarch64-15 6.6.0-82.0.0.75.oe2403.aarch64 #1 SMP Wed Mar 12 16:54:06 CST 2025 aarch64 aarch64 aarch64 GNU/Linux
[huangyang@aarch64-15 ~]$ sudo dnf provides grub2
Last metadata expiration check: 0:57:20 ago on Fri 21 Mar 2025 09:42:47 AM CST.
grub2-efi-aa64-1:2.12-14.oe2403.aarch64 : GRUB for EFI systems.
Repo        : OS
Matched from:
Provide    : grub2 = 1:2.12-14.oe2403
```

### loongarch架构修改之后的情况：

```
[root@97dc939c6179 rpmbuild]# dnf provides grub2
Last metadata expiration check: 0:09:39 ago on Fri Mar 21 11:05:33 2025.
grub2-efi-loongarch64-1:2.12-39.loongarch64 : GRUB for EFI systems.
Repo        : @System
Matched from:
Provide    : grub2 = 1:2.12-39
```

src-openEuler/grub2

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