Use keyboard config for nkro (#7)

* removing nkro references - wip

* changed NKRO to be defined by keymap_config

tmk_core/common/host.c

@@ -22,11 +22,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include "util.h"
 #include "debug.h"
 
-
-#ifdef NKRO_ENABLE
-bool keyboard_nkro = true;
-#endif
-
 static host_driver_t *driver;
 static uint16_t last_system_report = 0;
 static uint16_t last_consumer_report = 0;