qcacld-3.0: Change Internal/External to External

Change the usage of cfg parameters from Internal/External
to External in .h description for mlme, p2p, and
policy manager files.
External means that both internal teams and external
customers can modify the parameters.

Change-Id: Ic1e68d5a90be2c898ce66aa18e8d91f16561b408
CRs-Fixed: 2712773

components/p2p/dispatcher/inc/wlan_p2p_cfg.h

@@ -36,7 +36,7 @@
  *
  * Supported Feature: P2P
  *
- * Usage: Internal/External
+ * Usage: External
  *
  * </ini>
  */
@@ -62,7 +62,7 @@
  *
  * Supported Feature: P2P
  *
- * Usage: Internal/External
+ * Usage: External
  *
  * </ini>
  */
@@ -89,7 +89,7 @@
  *
  * Supported Feature: P2P
  *
- * Usage: Internal/External
+ * Usage: External
  *
  * </ini>
  */