[sky2] Add support for Marvell Yukon-II gigabit Ethernet cards

Signed-off-by: Michael Brown <mcb30@etherboot.org>

src/include/gpxe/errfile.h

@@ -111,6 +111,7 @@ FILE_LICENCE ( GPL2_OR_LATER );
 #define ERRFILE_ne2k_isa	     ( ERRFILE_DRIVER | 0x004c0000 )
 #define ERRFILE_b44		     ( ERRFILE_DRIVER | 0x004d0000 )
 #define ERRFILE_rtl818x		     ( ERRFILE_DRIVER | 0x004e0000 )
+#define ERRFILE_sky2                 ( ERRFILE_DRIVER | 0x004f0000 )
 
 #define ERRFILE_scsi		     ( ERRFILE_DRIVER | 0x00700000 )
 #define ERRFILE_arbel		     ( ERRFILE_DRIVER | 0x00710000 )