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

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

Change-Id: Ie124c2cec8e4235ae999463d5c03615880e0c01e