Fix clang -Wc++11-narrowing warnings.

Clang compiler gives warning to implicit conversions of
literal structure fields, although the compiler generated
implicit conversions are what we want in these cases.

Change-Id: Ibd987b4b4403920bb54452f7f433c432968478c2
diff --git a/camera/QCameraHWI_Parm.cpp b/camera/QCameraHWI_Parm.cpp
index 40e8907..72baa33 100644
--- a/camera/QCameraHWI_Parm.cpp
+++ b/camera/QCameraHWI_Parm.cpp
@@ -699,7 +699,7 @@
 
 rat_t getRational(int num, int denom)
 {
-    rat_t temp = {num, denom};
+    rat_t temp = {(uint32_t)num, (uint32_t)denom};
     return temp;
 }