Retire duplicate qemu_pipe and gralloc_cb headers am: a07b54a645 am: c531ccd77a am: 4b431bb52f

Original change: https://googleplex-android-review.googlesource.com/c/device/generic/goldfish-opengl/+/11603441

Change-Id: I0c880f6479d3ea4a0b9e437c1b01b6943b84eef0