drm/exynos5: hdmi-audio calls removed

drm/exynos5: hdmi-audio calls removed

For exynos5, hdmi-audio code is moved to /sound/soc. This helps in
reconfiguring the hdmi-audio whenever there is a change in audio
params.

BUG=none
TEST=verified various audio files using aplay
application.

Change-Id: I8f7a418b692c238d878fd7c0ad37a5aba8a75c52
Signed-off-by: Rahul Sharma <rahul.sharma@samsung.com>
Reviewed-on: https://gerrit.chromium.org/gerrit/31362
Reviewed-by: Dylan Reid <dgreid@chromium.org>
Commit-Ready: Dylan Reid <dgreid@chromium.org>
Tested-by: Dylan Reid <dgreid@chromium.org>