Update namespace in libandroidemu to gfxstream::guest

... to avoid conflicts when the guest is built for the host
for end2end tests.

In the future, the differences between libandroidemu and
hardware/google/aemu/base/ should be consolidated and there
should be a single shared library as there isn't really
anything guest/host specific about either of these copies.

Bug: b/292257025
Test: cvd start --gpu_mode=gfxstream
      cvd start --gpu_mode=gfxstream_guest_angle_host_swiftshader
Change-Id: I17690ab0123a69626ef4b627e0f881e5840903f6
2 files changed