Revert "Disable test 727 on target."

This reverts commit 34807565e665dbd43ed10d75782e3dc95ca9fd31.

Reason for revert: Fix the test on target.
Use $DEX_LOCATION instead of $PWD to specify the path to the
`updatable.txt`. Move the file to the `res/` folder so that
it is pushed to the device.

Test: testrunner.py --target -t 727
Test: testrunner.py --host -t 727
Bug: 161898207
Change-Id: I1616e79fb9296a7e11dcd7deb6f9fcfe05459bb1
3 files changed