arm64: samsung: MAINTAINERS: Add Tesla FSD DTS to Exynos entry

arm64: samsung: MAINTAINERS: Add Tesla FSD DTS to Exynos entry

Effectively all Tesla FSD DTS patches go via Samsung Exynos SoC
maintainer, so add the pattern to make it obvious and reduce the chances
patches won't reach these maintainers.

Cc: Peter Griffin <peter.griffin@linaro.org>
Cc: André Draszik <andre.draszik@linaro.org>
Cc: Tudor Ambarus <tudor.ambarus@linaro.org>
Cc: Alim Akhtar <alim.akhtar@samsung.com>
Reviewed-by: Alim Akhtar <alim.akhtar@samsung.com>
Reviewed-by: André Draszik <andre.draszik@linaro.org>
Link: https://lore.kernel.org/r/20250710073443.13788-4-krzysztof.kozlowski@linaro.org
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>