Added CCIN for ISDIMM

  CCIN values added based on Bonnell_IS_DIMM Service Plan_v2

Change-Id: Ic836802bec723f6ca8001e9b2c09f6fb696e4587
Signed-off-by: jinuthomas <jinu.joy.thomas@in.ibm.com>
diff --git a/const.hpp b/const.hpp
index 7d9666e..8b75758 100644
--- a/const.hpp
+++ b/const.hpp
@@ -80,6 +80,7 @@
 static constexpr auto SPD_BYTE_6 = 6;
 static constexpr auto SPD_BYTE_12 = 12;
 static constexpr auto SPD_BYTE_13 = 13;
+static constexpr auto SPD_BYTE_18 = 18;
 static constexpr auto SPD_BYTE_BIT_0_3_MASK = 0x0F;
 static constexpr auto SPD_BYTE_MASK = 0xFF;