Fix build error.

Original name INFINITY conflicts with the macro in math.h.

Change-Id: I9845ed84fca17813dd971239a902cc1e0bad1e3e
diff --git a/libs/camera/CameraParameters.cpp b/libs/camera/CameraParameters.cpp
index 035fa9f..7b4c7f6 100644
--- a/libs/camera/CameraParameters.cpp
+++ b/libs/camera/CameraParameters.cpp
@@ -72,7 +72,7 @@
 const char CameraParameters::KEY_FOCUS_DISTANCES[] = "focus-distances";
 
 const char CameraParameters::TRUE[] = "true";
-const char CameraParameters::INFINITY[] = "Infinity";
+const char CameraParameters::FOCUS_DISTANCE_INFINITY[] = "Infinity";
 
 // Values for white balance settings.
 const char CameraParameters::WHITE_BALANCE_AUTO[] = "auto";