arm64: defconfig: enable DRM_DISPLAY_CONNECTOR as a module

arm64: defconfig: enable DRM_DISPLAY_CONNECTOR as a module

The display connector family of bridges is used on a plenty of ARM64
platforms (including, but not being limited to several Qualcomm Robotics
and Dragonboard platforms). It doesn't make sense for the DRM drivers to
select the driver, so select it via the defconfig.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20250214-arm64-display-connector-v1-1-306bca76316e@linaro.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>