gst-plugin-aml-v4l2: CF1 Undefine ABSDIFF [1/1]

PD#SWPL-92295

Problem:
Undefine ABSDIFF

Solution:
define ABSDIFF

Verify:
A311D2-AN400

Change-Id: I27a4b8424ab00429079033848832e7eea6efa6c8
Signed-off-by: hanghang.luo <hanghang.luo@amlogic.com>
diff --git a/src/gstamlv4l2videodec.c b/src/gstamlv4l2videodec.c
index d8ec277..d796b86 100644
--- a/src/gstamlv4l2videodec.c
+++ b/src/gstamlv4l2videodec.c
@@ -57,6 +57,10 @@
     }
 #endif
 
+#ifndef ABSDIFF
+#define ABSDIFF(a,b) (((a) > (b)) ? ((a) - (b)) : ((b) - (a)))
+#endif
+
 #if GST_IMPORT_LGE_PROP
 typedef struct _GstAmlResourceInfo
 {