ARM: dts: aspeed: ast2600: Add Video Engine node

The AST2600 has Video Engine so add it.

Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo@linux.intel.com>
Acked-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Joel Stanley <joel@jms.id.au>