Revert "android: export libcamera_metadata and libsync to sysroot"

This reverts commit 8fe1ca6f0f321d6e71d4ae27ff05fec17cb7cf8f.

Reason for revert: Revert to fix CQ

Original change's description:
> android: export libcamera_metadata and libsync to sysroot
> 
> The patch makes the following modifications to the build tools in order
> to export android libraries to sysroot:
> 
> 1. Remove source and header files which are now provided by libcamera_metadata
>    or libsync.
> 2. Make android/ an independent build root. Originally it was a submodule
>    of arc-camera/. This is to strip dependency on libchrome. The android
>    libraries do not require libchrome to build.
> 3. Update the module.mk of hal_adapter/, usb/hal/, and camera3_test/
>    accordingly so that they link to the exported libcamera_metadata and
>    libsync.
> 
> BUG=b:36919374
> CQ-DEPEND=CL:475313
> TEST=emerge-<board> arc-camear3|arc-camera3-hal-usb|arc-camera3-test
> 
> Change-Id: If9e024fc8ad2aa703922e814f36ecde30bd60b5d
> Reviewed-on: https://chromium-review.googlesource.com/475312
> Reviewed-by: Ricky Liang <jcliang@chromium.org>
> Tested-by: Ricky Liang <jcliang@chromium.org>
> 

TBR=jcliang@chromium.org,wuchengli@chromium.org,henryhsu@chromium.org,hywu@chromium.org,akeshet@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=b:36919374

Change-Id: I0cc843345fe60e0384aeac5a8c93fe2ea6e88aa8
Reviewed-on: https://chromium-review.googlesource.com/484559
Commit-Queue: Ricky Liang <jcliang@chromium.org>
Tested-by: Ricky Liang <jcliang@chromium.org>
Trybot-Ready: Ricky Liang <jcliang@chromium.org>
Reviewed-by: Ningning Xia <nxia@chromium.org>
19 files changed