Remove obsolete and invalid AOSP recovery fstab config

The BoardConfig.mk was specified to use the system fstab for recovery as
well, instead of the dedicated recovery fstab. This broke mounting of
external SD cards in AOSP recovery.

Issue: FP2N-395
Change-Id: I876274d475a016d4339b150eee661d962358eeb6
Depends-On: I0da53df10de749300f93c482e921cb17d7681b54
1 file changed