sd-device: keep escaped strings in DEVLINK= property
This fixes a bug introduced by
87a4d416e5126b6fb2528ae192a6a6a8033539ce.
Fixes #17772.
(cherry picked from commit
31063db0b4842a452c6eadde5b969aaee2a0516a)
Gbp-Pq: Name sd-device-keep-escaped-strings-in-DEVLINK-property.patch