Fix sim-eng build and simplify previous lcd-density related patch

    char property[PROPERTY_VALUE_MAX];

    /* Read density from build-specific ro.sf.lcd_density property

     * except if it is overriden by qemu.sf.lcd_density.

     */

    if (property_get("qemu.sf.lcd_density", property, NULL) <= 0) {

        if (property_get("ro.sf.lcd_density", property, NULL) <= 0) {

            LOGW("ro.sf.lcd_density not defined, using 160 dpi by default.");

            strcpy(property, "160");

        }

    /* Override the property value if qemu.sf.lcd_density is defined. */

    {

        char  qemu_property[PROPERTY_VALUE_MAX];

        if (property_get("qemu.sf.lcd_density", qemu_property, NULL) > 0) {

            strlcpy(property, qemu_property, sizeof property);

        }

    }

    mDensity = atoi(property) * (1.0f/160.0f);