ARM: dts: omap2: add stlc4560 spi-wireless node

Converted from the platform_device creation in board-n8x0.c.

Link: https://lore.kernel.org/all/20230314163201.955689-1-arnd@kernel.org/
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Reviewed-by: Linus Walleij <linusw@kernel.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Link: https://patch.msgid.link/20260507212451.3333185-4-arnd@kernel.org
Signed-off-by: Johannes Berg <johannes.berg@intel.com>