ARM: dts: dra7x-evm: switch to new cpsw switch drv

Switch all TI DRA7x boards to use new cpsw switch driver. Those boards
configured in dual_mac mode by default. Hence, dual_mac mode has been
preserved the same way between legacy and new driver it's safe to switch
drivers.

Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>