ARM: multi_v7_defconfig: Enable r8a774[35] SoCs

Enable recently added r8a7743 (RZ/G1M) and r8a7745 (RZ/G1E) SoCs.

Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>