Add data structure for CPS calculation in DL

Define new data structure with respect to TS 44.060
10.4.8a.3.1, 10.4.8a.2.1, 10.4.8a.1.1 for puncturing scheme values
and initialize the variable introduced
diff --git a/src/rlc.cpp b/src/rlc.cpp
index 79d8f48..0e16ee8 100644
--- a/src/rlc.cpp
+++ b/src/rlc.cpp
@@ -33,6 +33,9 @@
 	memset(block, 0x0, sizeof(block));
 	memset(block, 0x2b, block_data_len);
 
+	/* Initial value of puncturing scheme */
+	next_ps = EGPRS_PS_1;
+
 	return block;
 }