Revert "build: add qt5multimedia as a dependency"

This reverts commit 12769565.

Reason for revert: libcanberra will be used
Change-Id: I4a92146ec06c7d6cf7856526032ee265f6517ef3

docker/Dockerfile_ubuntu_16.04

@@ -20,7 +20,6 @@ RUN apt-get update && \
         libgtk-3-dev \
         libnotify-dev \
         qtbase5-dev \
-        qtmultimedia5-dev \
         qttools5-dev \
         qttools5-dev-tools \
         yasm \

docker/Dockerfile_ubuntu_18.04

@@ -20,7 +20,6 @@ RUN apt-get update && \
         libgtk-3-dev \
         libnotify-dev \
         qtbase5-dev \
-        qtmultimedia5-dev \
         qttools5-dev \
         qttools5-dev-tools \
         yasm \