[GWP-ASan] Enable backtrace/enable_disable/iterate tests.

Enable the enable_disable & iterate tests on Android. These work out of
the box.

Also enable the backtrace test. In AOSP we do this via the new interface
with libunwindstack to get a frame from a previously-collected FP. In
rvc-dev, we simply copy the function that does this into the GWP-ASan
tests, to avoid an API break.

Bug: 152414185
Test: SANITIZE_TARGET=hwaddress atest gwp_asan_unittest
Change-Id: Ie02f8fdcb28b4324f07517874b45996e0b59c8df
Merged-In: Ie02f8fdcb28b4324f07517874b45996e0b59c8df
3 files changed