kernel: fix generic/3.18 wpan symbols

-removed symbol because it should be handled by wpan.mk
-add missing FAKEHARD symbol (this symbol is removed in Kernel 4.0)

Signed-off-by: Dirk Neukirchen <dirkneukirchen@web.de>

SVN-Revision: 45530

target/linux/generic/config-3.18

@@ -1428,7 +1428,7 @@ CONFIG_HZ_100=y
 # CONFIG_IDE_PHISON is not set
 # CONFIG_IDE_PROC_FS is not set
 # CONFIG_IDE_TASK_IOCTL is not set
-# CONFIG_IEEE802154 is not set
+# CONFIG_IEEE802154_FAKEHARD is not set
 # CONFIG_IFB is not set
 # CONFIG_IGB is not set
 # CONFIG_IGBVF is not set