hi3520dv200: enable CONFIG_OVERLAYFS_FS (mirror hi3516cv100)#2096
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Without overlayfs the rootfs stays squashfs read-only after /init's overlay check fails, /var/lib and /etc cannot be written, and fw_printenv spams "Cannot parse config file '/etc/fw_env.config'" from every init script that consults the U-Boot env. hi3516cv100 (same Linux 3.0.x base) ships the overlayfs-v11 backport and this flag enabled. Pairs with OpenIPC/linux#40 which cherry-picks the v11 backport onto the hisilicon-hi3520dv200 kernel branch (already merged). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Summary
Why
On a freshly-flashed hi3520dv200, `general/overlay/init` exits at the `grep -q overlay /proc/filesystems || exit 1` check because Linux 3.0.8 ships with no overlayfs. The rootfs stays squashfs-read-only, `/var/lib` and `/etc` are not writable, and every init script that calls `fw_printenv` (rcS, S40network, S98wireguard, /etc/profile, udhcpc default.script, …) prints:
```
Cannot parse config file '/etc/fw_env.config': No such file or directory
```
hi3516cv100 (same Linux 3.0.x kernel vintage) doesn't have this problem because its branch carries the overlayfs-v11 backport and the matching `CONFIG_OVERLAYFS_FS=y` flag.
With OpenIPC/linux#40 merged and this flag flipped:
Test plan
Known limitation
A second, unrelated source of `Cannot parse config file '/etc/fw_env.config'` spam remains on factory-raw flash: the OpenIPC `fw_env` patch (`0011-env-partition-autosearch.patch`) locates the env partition by CRC-scanning each MTD, which fails when the env partition is still erased (all `0xFF`). That affects every SoC, not just hi3520dv200, and is out of scope for this PR.