ARM: dts: davinci: da850: VPIF: add node and muxing

Add VPIF node and pins to da850 SoC.  VPIF has two input channels which
can be described using the standard DT ports and endpoints.

Signed-off-by: Kevin Hilman <khilman@baylibre.com>
[nsekhar@ti.com: drop stray newline, typo fixes in commit message]
Signed-off-by: Sekhar Nori <nsekhar@ti.com>