libcamera: for supporting QVGA and QCIF on front camera

Feature: Supporting QVGA is Google's request for gtalk.
         Additionally, QCIF is supported because device driver
         already support it.

Change-Id: I702e433cadf216c7fda141a6703d64c3dd1dc420
Signed-off-by: Jeong-Seok Yang <jseok.yang@samsung.com>
diff --git a/libcamera/SecCameraHWInterface.cpp b/libcamera/SecCameraHWInterface.cpp
index fed80e3..8a1275e 100644
--- a/libcamera/SecCameraHWInterface.cpp
+++ b/libcamera/SecCameraHWInterface.cpp
@@ -163,7 +163,7 @@
               "2560x1920,2048x1536,1600x1200,1280x960,640x480");
     } else {
         p.set(CameraParameters::KEY_SUPPORTED_PREVIEW_SIZES,
-              "640x480,176x144");
+              "640x480,320x240,176x144");
         p.set(CameraParameters::KEY_SUPPORTED_PICTURE_SIZES,
               "640x480");
     }