sdm: Add support to disable NoSplit strategy

Add support to disable NoSplit strategy by setting the system prop
"sdm.debug.prefersplit" to '1'.

CRs-Fixed: 2068538
Change-Id: I7ea1f98a8a300fa077d889a7e46768416106db6d
diff --git a/sdm/include/utils/debug.h b/sdm/include/utils/debug.h
index 0b40e7b..d5974d9 100644
--- a/sdm/include/utils/debug.h
+++ b/sdm/include/utils/debug.h
@@ -78,6 +78,7 @@
   static bool IsAVRDisabled();
   static bool IsExtAnimDisabled();
   static bool IsPartialSplitDisabled();
+  static bool IsSrcSplitPreferred();
   static DisplayError GetMixerResolution(uint32_t *width, uint32_t *height);
   static DisplayError GetReducedConfig(uint32_t *num_vig_pipes, uint32_t *num_dma_pipes);
   static int GetExtMaxlayers();