Merge "remove unusued line_coverage.mk and build target" am: 89e9c8fb am:...

Merge "remove unusued line_coverage.mk and build target" am: 89e9c8fb am: 25d8e36d am: c28696a0 am: 13d71b8b

Original change: https://android-review.googlesource.com/c/platform/build/+/1433466

Change-Id: Id6f6a921f91c1b9c563fb163306574d204fdcdf2