arm64: defconfig: Enable Lontium LT8713sx driver

Lontium LT8713sx DP bridge hub can be found on a Qualcomm
Monaco EVK board for converting 1 DP to 3 DP outputs.

Signed-off-by: Vishnu Saini <vishnu.saini@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20260319-lt8713sx-bridge-linux-for-next-v4-2-da886ec78fe3@oss.qualcomm.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>

Author: Vishnu Saini

arch/arm64/configs/defconfig

@@ -1010,6 +1010,7 @@ CONFIG_DRM_ITE_IT6263=m
 CONFIG_DRM_LONTIUM_LT8912B=m
 CONFIG_DRM_LONTIUM_LT9611=m
 CONFIG_DRM_LONTIUM_LT9611UXC=m
+CONFIG_DRM_LONTIUM_LT8713SX=m
 CONFIG_DRM_ITE_IT66121=m
 CONFIG_DRM_NWL_MIPI_DSI=m
 CONFIG_DRM_PARADE_PS8640=m