WifiMetrics: Add metrics for HAL/wificond crashes

New metrics added:
1. Number of times HAL crashed during operation.
2. Number of times wificond crashed during operation.
3. Number of times wifi start failed because of a native issue.
Basically the number of times calls to WifiNative.setupForClientMode() &
WifiNative.setupForSoftApMode() fails.

Bug: 36586897
Test: Compiles
Change-Id: Ie9683fd8bfea6b0c64605e407559ff561898c11b
diff --git a/proto/src/wifi.proto b/proto/src/wifi.proto
index debb157..564d135 100644
--- a/proto/src/wifi.proto
+++ b/proto/src/wifi.proto
@@ -241,6 +241,20 @@
 
   // List of events
   repeated StaEvent sta_event_list = 52;
+
+  // Total number of times WiFi HAL crashed.
+  optional int32 num_hal_crashes = 53;
+
+  // Total number of times WiFicond crashed.
+  optional int32 num_wificond_crashes = 54;
+
+  // Indicates the number of times an error was encountered in
+  // Wifi HAL when wifi was turned on.
+  optional int32 num_wifi_on_failure_due_to_hal = 55;
+
+  // Indicates the number of times an error was encountered in
+  // Wificond when wifi was turned on.
+  optional int32 num_wifi_on_failure_due_to_wificond = 56;
 }
 
 // Information that gets logged for every WiFi connection.