ARM: dts: r8a7743: Remove aliases from SoC dtsi

This patch removes aliases from SoC dtsi tree. Device aliases are
board-specific, if needed define it in board dts rather than SoC
dtsi.

Signed-off-by: Biju Das <biju.das@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>