feat(bluetooth): Add back profiles, split fixes.

* Add back in profiles, not using Zephyr
  BT identity infrastructure.
* Restore additional `&bt` commands for profile
  operations.
* Fix for split pairing and subscriptions, since
  Zephyr persists subscriptions across connects.
* Remove keymap from peripheral builds, reduces
  firmware size, and avoids unneeded attempts
  to send HID data.

app/src/split/bluetooth/service.c

@@ -6,6 +6,11 @@
 
 #include <zephyr/types.h>
 #include <sys/util.h>
+
+#include <logging/log.h>
+
+LOG_MODULE_DECLARE(zmk, CONFIG_ZMK_LOG_LEVEL);
+
 #include <bluetooth/gatt.h>
 #include <bluetooth/uuid.h>
 
@@ -28,6 +33,7 @@ static ssize_t split_svc_num_of_positions(struct bt_conn *conn, const struct bt_
 
 static void split_svc_pos_state_ccc(const struct bt_gatt_attr *attr, u16_t value)
 {
+    LOG_DBG("value %d", value);
 }