arm64: dts: renesas: r9a09g047e57-smarc: Fix gpio key's pin control node

arm64: dts: renesas: r9a09g047e57-smarc: Fix gpio key's pin control node

Adding pin control node to the child won't parse the pins during driver
bind. Fix the issue by moving it to parent node.

This issue is observed while adding Schmitt input enable for PS0 pin on
later patch. Currently the reset value of the PIN is set to NMI function
and hence there is no breakage.

Fixes: 9e95446b0cf9 ("arm64: dts: renesas: r9a09g047e57-smarc: Add gpio keys")
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://patch.msgid.link/20250817145135.166591-2-biju.das.jz@bp.renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>