CHROMIUM: config: Switch exynos media back to static build

CHROMIUM: config: Switch exynos media back to static build

Turns out builds break for modules; we have to fix that but revert back
until fixes are in.

BUG=none
TEST=build chromeos-kernel for exynos

Change-Id: Ie46bce8d0e956b80860f6bcebb5049f6396548d3
Signed-off-by: Olof Johansson <olofj@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/26321
Reviewed-by: Sonny Rao <sonnyrao@chromium.org>
Reviewed-by: Pawel Osciak <posciak@google.com>