arm64: dts: renesas: rzg2ul-smarc: Enable RSPI1 on carrier board

RSPI1 (SPI1) interface is available on PMOD0 connector (J1) on the
carrier board.  This patch adds pinmux and spi1 nodes to the carrier
board dtsi file and drops deleting pinctl* properties from board
DTS file.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Link: https://lore.kernel.org/r/20220608173025.22792-2-biju.das.jz@bp.renesas.com


Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>