ARM: multi_v7_defconfig: omap2plus_defconfig: Enable ITE IT66121 driver

ARM: multi_v7_defconfig: omap2plus_defconfig: Enable ITE IT66121 driver

Enable the ITE IT66121 HDMI bridge driver to support HDMI output on
the BeagleBone Green with the Seeed Studio HDMI cape.

Enable CONFIG_DRM_TILCDC as a module on multi_v7_defconfig to provide
display support for TI AM335x-based SoCs in this kernel configuration.

Signed-off-by: Kory Maincent (TI) <kory.maincent@bootlin.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Link: https://patch.msgid.link/20260216-feature_bbge-v2-2-22805cfdbf62@bootlin.com
Signed-off-by: Kevin Hilman <khilman@baylibre.com>