staging: keucr: Delete StringCmp() and StringCopy custom functions

staging: keucr: Delete StringCmp() and StringCopy custom functions

Signed-off-by: Javier Martinez Canillas <martinez.javier@gmail.com>
Acked-by: Dan Carpenter <error27@gmail.com>
Reviewed-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Cc: Al Cho <acho@novell.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>