cameraservice_test: Add ZoomRatioTest to the host build.

ZoomRatioTest requires getArrayWidthAndHeight, which has been added in
this patch to SessionConfigurationUtilsHost.cpp.

Bug: 207411352
Test: Ran test on gLinux.
Change-Id: Ie1cd954cc49ab0f3bb80bd2fbe82397689c25dd2
diff --git a/services/camera/libcameraservice/utils/SessionConfigurationUtilsHost.h b/services/camera/libcameraservice/utils/SessionConfigurationUtilsHost.h
index 9da1b99..45b1e91 100644
--- a/services/camera/libcameraservice/utils/SessionConfigurationUtilsHost.h
+++ b/services/camera/libcameraservice/utils/SessionConfigurationUtilsHost.h
@@ -26,6 +26,9 @@
 
 int32_t getAppropriateModeTag(int32_t defaultTag, bool maxResolution = false);
 
+bool getArrayWidthAndHeight(const CameraMetadata *deviceInfo, int32_t arrayTag,
+        int32_t *width, int32_t *height);
+
 } // SessionConfigurationUtils
 } // camera3
 } // android