healthd: Add battery capacity to getProperty

Add support for BATTERY_PROP_CAPACITY property in getProperty

Bug: 11985952
Change-Id: I905cda68f990fa96138a16a11c55f2d902d0bbc1
diff --git a/healthd/BatteryMonitor.cpp b/healthd/BatteryMonitor.cpp
index 3e6a4b1..9368225 100644
--- a/healthd/BatteryMonitor.cpp
+++ b/healthd/BatteryMonitor.cpp
@@ -302,6 +302,16 @@
         }
         break;
 
+    case BATTERY_PROP_CAPACITY:
+        if (!mHealthdConfig->batteryCapacityPath.isEmpty()) {
+            val->valueInt =
+                getIntField(mHealthdConfig->batteryCapacityPath);
+            ret = NO_ERROR;
+        } else {
+            ret = NAME_NOT_FOUND;
+        }
+        break;
+
     default:
         break;
     }