pinctrl: renesas: Simplify PINCTRL_RZV2M logic

PINCTRL_RZV2M is selected by ARCH_R9A09G011, hence there is no need to
depend on the latter.  Move the dependency on COMPILE_TEST to the symbol
prompt, like is done for all other auto-selected pin control symbols.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Link: https://lore.kernel.org/d74843e06f73cd4c6e822d65f606e6042a50a0b7.1750945516.git.geert+renesas@glider.be