gemini: apm821xx: Ignore return value of e2fsck

gemini: apm821xx: Ignore return value of e2fsck

This fixes the build of the gemini and the apm821xx target.
The e2fsck application returns an error code now and that makes the
build fail. The tune2fs command adds an extra option and the e2fsck
should later fix the file system. It is intentionally broken in this
place.

e2fsprogs was patched before to ignore this error.

Fixes: 95e4664b5efc ("tools: e2fsprogs: drop e2fsck patch")
Link: https://github.com/openwrt/openwrt/pull/16607
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>