arm: shmobile_defconfig: Drop individual Renesas SoC entries

arm: shmobile_defconfig: Drop individual Renesas SoC entries

ARCH_RENESAS is already enabled in shmobile_defconfig, which ensures that
all ARM32 Renesas SoCs are enabled by default. As a result, explicitly
listing individual Renesas SoC entries is redundant. Remove these entries
to simplify the configuration.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/20250401090133.68146-4-prabhakar.mahadev-lad.rj@bp.renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>