Add cursor enable/disable, very useful if you wish a full screen boot
logo.
    
Cursor can be disabled from kernel command line:
    
   video=pxafb:nocursor
    
or from sysfs interface:
    
   echo 1 > /sys/module/pxafb/parameters/nocursor
    
Signed-off-by: Rodolfo Giometti <giometti@linux.it>