[RESTRICT AUTOMERGE] Remove build/libs

There's only a single library, libhost, and it's only used by acp and
atree in build/tools, move it there.

Bug: 109817231
Change-Id: Ifa58e58958d90fad008eb87a7eef4876b57b9edd
diff --git a/libs/host/Android.mk b/tools/libhost/Android.mk
similarity index 100%
rename from libs/host/Android.mk
rename to tools/libhost/Android.mk
diff --git a/libs/host/CopyFile.c b/tools/libhost/CopyFile.c
similarity index 100%
rename from libs/host/CopyFile.c
rename to tools/libhost/CopyFile.c
diff --git a/libs/host/include/host/CopyFile.h b/tools/libhost/include/host/CopyFile.h
similarity index 100%
rename from libs/host/include/host/CopyFile.h
rename to tools/libhost/include/host/CopyFile.h