arm64: defconfig: Enable DA9211 regulator

Mediatek mt8173 board fails to boot with DA9211 regulator disabled.
Enabling CONFIG_REGULATOR_DA9211=y in drm-ci fixes the issue.

So enable it in the defconfig since kernel-ci also requires it.
Suggested-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Vignesh Raman <vignesh.raman@collabora.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230911104139.617448-1-vignesh.raman@collabora.comSigned-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>

arch/arm64/configs/defconfig

@@ -737,6 +737,7 @@ CONFIG_REGULATOR_AXP20X=y
 CONFIG_REGULATOR_BD718XX=y
 CONFIG_REGULATOR_BD9571MWV=y
 CONFIG_REGULATOR_CROS_EC=y
+CONFIG_REGULATOR_DA9211=m
 CONFIG_REGULATOR_FAN53555=y
 CONFIG_REGULATOR_GPIO=y
 CONFIG_REGULATOR_HI6421V530=y