replace obsolete CONFIG_DYNAMIC_PRINTK_DEBUG with CONFIG_DYNAMIC_DEBUG

former is obsoleted by latter, done by
      commit e9d376f0
      Author: Jason Baron <jbaron@redhat.com>
      Date:   Thu Feb 5 11:51:38 2009 -0500

most defconfig mentions have been removed in the big defconfig cleanup, but the one
in s6105_defconfig remains.

Signed-off-by:  Jim Cromie <jim.cromie@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>