ARM: dts: STiH410: Enable clock propagation for audio clocks

This patch is used in the clock driver to apply a clock propagation
flag on the audio clocks of STiH410

Signed-off-by: Olivier Bideau <olivier.bideau@st.com>
Signed-off-by: Gabriel Fernandez <gabriel.fernandez@st.com>
Acked-by: Peter Griffin <peter.griffin@linaro.org>