arm64: dts: lg131x: Update spi clock properties

arm64: dts: lg131x: Update spi clock properties

PL022 binding require two clocks to be defined but LG1312 and LG1313
platforms don't comply with bindings and define only one clock.

Update spi clocks and clocks-names property by adding appropriate clock
reference to make it compliant with bindings.

CC: Chanho Min <chanho.min@lge.com>
Signed-off-by: Kuldeep Singh <singh.kuldeep87k@gmail.com>
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://lore.kernel.org/r/20241105-dts-spi-fixes-v2-2-623501e5d1ca@kernel.org
Signed-off-by: Arnd Bergmann <arnd@arndb.de>