Add API to get eUICC's OTA status

The function will return current eUICC's OTA status and requests calling
app has WRITE_EMBEDDED_SUBSCRIPTIONS.

Test: E2E
Bug: 37279356
Change-Id: I823ed7aa9d86530c4bebd4c0b1a00f0c607105ed
diff --git a/Android.bp b/Android.bp
index 2dcbc92..7d36a88 100644
--- a/Android.bp
+++ b/Android.bp
@@ -256,6 +256,7 @@
         "core/java/android/service/euicc/IGetEidCallback.aidl",
         "core/java/android/service/euicc/IGetEuiccInfoCallback.aidl",
         "core/java/android/service/euicc/IGetEuiccProfileInfoListCallback.aidl",
+        "core/java/android/service/euicc/IGetOtaStatusCallback.aidl",
         "core/java/android/service/euicc/IRetainSubscriptionsForFactoryResetCallback.aidl",
         "core/java/android/service/euicc/ISwitchToSubscriptionCallback.aidl",
         "core/java/android/service/euicc/IUpdateSubscriptionNicknameCallback.aidl",