remove(nimble): Removed unused coex header inclusion

components/bt/host/nimble/nimble

@@ -1 +1 @@
-Subproject commit da4bcac49f6ee4d874bacb7bc6fd6f5e24155d2f
+Subproject commit 48bb80dab7f0e5c6e5a2da09357896edd260b6e4