ARM: dts: k2g-evm: Add DCAN dt nodes

The 66AK2G evm has support for dcan.
Add nodes and pinmuxes for dcan0 and dcan1.

Signed-off-by: Faiz Abbas <faiz_abbas@ti.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>