ARM: dts: am335x-evm: Add DCAN1 details

DCAN1 is routed to CAN port (J11) when Profile 1 is selected on the
profile selection switch.
Provide information for DCAN1 pins and node but keep it disabled
by default. User has to manually enable it if Profile 1 is chosen.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>