HWC2: Clear transform for SolidColor layers

    // SolidColor layers

    if (mActiveBuffer == nullptr) {

        setCompositionType(hwcId, HWC2::Composition::SolidColor);

        // For now, we only support black for DimLayer

        error = hwcLayer->setColor({0, 0, 0, 255});

        if (error != HWC2::Error::None) {

            ALOGE("[%s] Failed to set color: %s (%d)", mName.string(),

                    to_string(error).c_str(), static_cast<int32_t>(error));

        }

        // Clear out the transform, because it doesn't make sense absent a

        // source buffer

        error = hwcLayer->setTransform(HWC2::Transform::None);

        if (error != HWC2::Error::None) {

            ALOGE("[%s] Failed to clear transform: %s (%d)", mName.string(),

                    to_string(error).c_str(), static_cast<int32_t>(error));

        }

        return;

    }