Merge "vold: only allow emmc_optimized on eMMC storage" am: 428ae6e90a am: 7a1c4ccb96 am: 09f789e227

Original change: https://android-review.googlesource.com/c/platform/system/vold/+/1356175

Change-Id: I277065540c289ff3a7633ebd7b0326da2da4e5a4