ARM: dts: rza2mevb: Add USB Host support

Enable USB Host support for both the Type-C connector on the CPU board
and the Type-A plug on the sub board.

Both boards are also capable of USB Device operation as well after the
appropriate Device Tree modifications.

Signed-off-by: Chris Brandt <chris.brandt@renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>