Camera: Fix up log message for CameraProviderManager

addProviderLocked may be called for a provider that's not started yet.
User ALOGW rather than ALOGE.

Test: Build
Bug: 184195382
Change-Id: I91b8c4406d84f6878e7fa09383e41e636e1be2ab
diff --git a/services/camera/libcameraservice/common/CameraProviderManager.cpp b/services/camera/libcameraservice/common/CameraProviderManager.cpp
index 62fc18f..8942d05 100644
--- a/services/camera/libcameraservice/common/CameraProviderManager.cpp
+++ b/services/camera/libcameraservice/common/CameraProviderManager.cpp
@@ -1243,7 +1243,9 @@
     interface = mServiceProxy->tryGetService(newProvider);
 
     if (interface == nullptr) {
-        ALOGE("%s: Camera provider HAL '%s' is not actually available", __FUNCTION__,
+        // The interface may not be started yet. In that case, this is not a
+        // fatal error.
+        ALOGW("%s: Camera provider HAL '%s' is not actually available", __FUNCTION__,
                 newProvider.c_str());
         return BAD_VALUE;
     }