hwc/copybit: Add check for Max layers support.

Add check in copybit for Max. layers supported by HWC. Increase
max. RGB surfaces to MAX_NUM_LAYERS to support known use cases.

CRs-Fixed: 481226
Change-Id: Ie30ab0ef3047a304133cb547902ae11fecc5db22
diff --git a/libcopybit/copybit_c2d.cpp b/libcopybit/copybit_c2d.cpp
index b804c21..6973704 100644
--- a/libcopybit/copybit_c2d.cpp
+++ b/libcopybit/copybit_c2d.cpp
@@ -105,7 +105,7 @@
 
 // The following defines can be changed as required i.e. as we encounter
 // complex use cases.
-#define MAX_RGB_SURFACES 12        // Max. RGB layers currently supported per draw
+#define MAX_RGB_SURFACES 32       // Max. RGB layers currently supported per draw
 #define MAX_YUV_2_PLANE_SURFACES 4// Max. 2-plane YUV layers currently supported per draw
 #define MAX_YUV_3_PLANE_SURFACES 1// Max. 3-plane YUV layers currently supported per draw
 // +1 for the destination surface. We cannot have multiple destination surfaces.