arm64: dts: renesas: beacon kit: Remove unnecessary nodes

VSPI0 and VSPB are already enabled by default.  There is no need
to add extra nodes to enable them.  Remove the redundant nodes.

Signed-off-by: Adam Ford <aford173@gmail.com>
Link: https://lore.kernel.org/r/20201213183759.223246-4-aford173@gmail.com


Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>