arm64: defconfig: enable FSA4480 driver as module

Enable the FSA4480 driver as module for Qualcomm HDK8350 and HDK8450
platforms to permit USB-C Altmode support.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230503-topic-sm8450-graphics-dp-next-v3-5-6c43d293995f@linaro.org