hwc: Add app buffer composition(ABC) flags in dumpsys

We can check ABC status for each usecase in sf dumpsys.

Change-Id: I154fc908e19128b618feedf6d8093c7d85b97043
diff --git a/libhwcomposer/hwc.cpp b/libhwcomposer/hwc.cpp
index 0a7f940..de1fde0 100644
--- a/libhwcomposer/hwc.cpp
+++ b/libhwcomposer/hwc.cpp
@@ -878,6 +878,7 @@
         dumpsys_log(aBuf, ovDump);
         ovDump[0] = '\0';
     }
+    dumpsys_log(aBuf, "Copybit::isAbcInUse=%d\n\n",isAbcInUse(ctx) ? 1 : 0);
     strlcpy(buff, aBuf.string(), buff_len);
 }