ARM: multi_v7_defconfig: make Exynos related PHYs modules

Exynos Display Port PHY and Exynos MIPI Video PHY drivers are not
essential to boot on the Exynos based system, so make them modules
instead of build-in.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Link: https://lore.kernel.org/r/20230929121800.1722211-1-m.szyprowski@samsung.com


Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>