arm64: defconfig: Enable Lontium LT9611 driver

Lontium LT9611 HDMI bridge can be found in Dragon Board RB3 for
converting DSI to HDMI. Enable this driver to get display working on RB3
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Link: https://lore.kernel.org/r/20200727080118.1934079-1-vkoul@kernel.orgSigned-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

arch/arm64/configs/defconfig

@@ -643,6 +643,7 @@ CONFIG_DRM_PANEL_SIMPLE=m
 CONFIG_DRM_SIMPLE_BRIDGE=m
 CONFIG_DRM_PANEL_TRULY_NT35597_WQXGA=m
 CONFIG_DRM_DISPLAY_CONNECTOR=m
+CONFIG_DRM_LONTIUM_LT9611=m
 CONFIG_DRM_SII902X=m
 CONFIG_DRM_THINE_THC63LVD1024=m
 CONFIG_DRM_TI_SN65DSI86=m