drm/msm: select DRM_DP_AUX_BUS for the AUX bus support

Add missing dependency on the AUX bus implementation.

Fixes: c3bf8e21 ("drm/msm/dp: Add eDP support via aux_bus")
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/483406/
Link: https://lore.kernel.org/r/20220426004128.2832555-1-dmitry.baryshkov@linaro.orgSigned-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

drivers/gpu/drm/msm/Kconfig

@@ -12,6 +12,7 @@ config DRM_MSM
 	select IOMMU_IO_PGTABLE
 	select QCOM_MDT_LOADER if ARCH_QCOM
 	select REGULATOR
+	select DRM_DP_AUX_BUS
 	select DRM_DP_HELPER
 	select DRM_KMS_HELPER
 	select DRM_PANEL