Remove unmaintained tests.

Tests under hwc2/ are not run and unmaintained for a long time, remove
them all.

Bug: b/77585359
Test: N/A
Change-Id: If4e0a8390671e573361fda477a77e332f49ef245
Merged-In: If4e0a8390671e573361fda477a77e332f49ef245
16 files changed