[automerger skipped] vold: only allow emmc_optimized on eMMC storage am: 006eed8e3a -s ours

am skip reason: Change-Id Ie27b80658db53b1a4207b3cbb4e309d05130812e with SHA-1 eb566d0a7c is in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/system/vold/+/12098822

Change-Id: Id8c90f1833a171c12936a5f4aa2bf80574f5cb64