examples: x86: delete 82559_eeprom

Commit fea25720 renamed arch/i386 to arch/x86.
But it missed to modify examples/standalone/Makefile.

Since then, examples/standalone/82559_eeprom has
never compiled and nobody has noticed that.

After some discussion on ML, we agreed to delete this example.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
diff --git a/Makefile b/Makefile
index ca3c5c3..e9fc83c 100644
--- a/Makefile
+++ b/Makefile
@@ -755,8 +755,7 @@
 #########################################################################
 
 clean:
-	@rm -f $(obj)examples/standalone/82559_eeprom			  \
-	       $(obj)examples/standalone/atmel_df_pow2			  \
+	@rm -f $(obj)examples/standalone/atmel_df_pow2			  \
 	       $(obj)examples/standalone/eepro100_eeprom		  \
 	       $(obj)examples/standalone/hello_world			  \
 	       $(obj)examples/standalone/interrupt			  \