arm64: defconfig: Enable Exynos UFS driver

Enable the Exynos UFS controller and PHY configs. They need to be
buildin to ensure UFS devices gets detected on exynos7 and its
variant boards.

Signed-off-by: Alim Akhtar <alim.akhtar@samsung.com>
Link: https://lore.kernel.org/r/20210531170057.7730-1-alim.akhtar@samsung.com


Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>