spi: dt-bindings: samsung: Add a compatible for samsung,exynos8895-spi

spi: dt-bindings: samsung: Add a compatible for samsung,exynos8895-spi

According to the vendor kernel, the Exynos8895 SoC has an SPI
configuration that matches with the Exynos850 one.

SPI FIFO depth is 64 bytes for all SPI blocks. All blocks have DIV_4
as the default internal clock divider, and an internal loopback mode
to run a loopback test.

Reuse the samsung,exynos850-spi compatible.

Signed-off-by: Ivaylo Ivanov <ivo.ivanov.ivanov1@gmail.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://patch.msgid.link/20241020182121.377969-3-ivo.ivanov.ivanov1@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>