Conditionally compile code for specific roles.

This allows NimBLE options in menuconfig to reduce code size based on
the roles selected (scan/advertising/central/peripheral).

Significant code space can be saved by removing unnecessary roles for the application.

src/NimBLEAddress.cpp

@@ -3,7 +3,7 @@
  *
  *  Created: on Jan 24 2020
  *      Author H2zero
- * 
+ *
  * Originally:
  *
  * BLEAddress.cpp