wifi.proto: Add metrics for softap band preference unsatisfied

Bug: 79701630
Test: Unit tests
Test: Validated that the metric is updated when STA + AP forces the AP
to not satisfy the band preference.

Change-Id: I7d749d33668d0b05ec4beedfa8d5b79b855e3372
diff --git a/proto/src/wifi.proto b/proto/src/wifi.proto
index 8fa6b3e..9ff8e7d 100644
--- a/proto/src/wifi.proto
+++ b/proto/src/wifi.proto
@@ -450,6 +450,9 @@
 
   // Number of radio mode changes to DBS (Dual band simultaneous).
   optional int32 num_radio_mode_change_to_dbs = 115;
+
+  // Number of times the firmware picked a SoftAp channel not satisfying user band preference.
+  optional int32 num_soft_ap_user_band_preference_unsatisfied = 116;
 }
 
 // Information that gets logged for every WiFi connection.