docker: Check for qemu outside only

The tests for qemu-aarch64 and qemu-user-static is being done both outside and
inside the container. This isn't correct -- we should only do this once, and
only outside.

Change-Id: I827c08fe751baf222a6a77ac3a6668dfbbe9e78b
(cherry picked from commit c6120fdd89e8101646e03ce612d2e64749f439e2)
1 file changed