ARM: dts: exynos: Add support for secondary DAI to Odroid XU4

This patch extends DAPM routing and adds secondary CPU DAI entry
to support the secondary audio PCM interface on Odroid XU4.

Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>