ARM: dts: dra76x: Add MCAN node

Add support for the MCAN peripheral which supports both classic
CAN messages along with the new CAN-FD message.

Add MCAN node to evm and enable it with a maximum datarate of 5 mbps

Signed-off-by: Faiz Abbas <faiz_abbas@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>