arm64: defconfig: Enable TDA19988

The EK874 board comes with a TDA19988 chip on board, therefore
enable it in the defconfig.
Signed-off-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm64/configs/defconfig

@@ -478,6 +478,7 @@ CONFIG_VIDEO_SAMSUNG_EXYNOS_GSC=m
 CONFIG_VIDEO_RENESAS_FCP=m
 CONFIG_VIDEO_RENESAS_VSP1=m
 CONFIG_DRM=m
+CONFIG_DRM_I2C_NXP_TDA998X=m
 CONFIG_DRM_NOUVEAU=m
 CONFIG_DRM_EXYNOS=m
 CONFIG_DRM_EXYNOS5433_DECON=y