Mark test as unit_tests am: 06b410221f am: abc6378c06 am: 1db97ecf7a

Original change: https://android-review.googlesource.com/c/platform/system/tools/sysprop/+/1526878

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I2d7ab6ec41596250518bb1e7985469f817caf4fb