[autotest] multimedia_xmlrpc_server: fix import path

Fix import path for xmlrpc_server.

BUG=chromium:518110
TEST=run chameleon_audio test suite.
Signed-off-by: Cheng-Yi Chiang <cychiang@chromium.org>
Change-Id: I4eb5285aa395b2801355baae6165c2bfd166dbc5
Reviewed-on: https://chromium-review.googlesource.com/293435
Reviewed-by: Yuli Huang <yuli@chromium.org>
1 file changed