ARM: dts: stm32: set bus-type in DCMI endpoint for stm32429i-eval board

Explicitly set bus-type to parallel mode in DCMI endpoint (bus-type=5).

Signed-off-by: Hugues Fruchet <hugues.fruchet@st.com>
Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>