ARM: dts: DRA74x: Add the VIP node

The DRA74xx/AM57xx has three Video Input Ports (VIP) i.e., VIP1, VIP2,
and VIP3.
Add VIP2 port node which has 2 slices VIN3 and VIN4.

Signed-off-by: Sukrut Bellary <sbellary@baylibre.com>