Add TC to test pldmtool RAW commands

Changes:
Added two new TCs to verify pldmtool RAW commands

Tested:
Tested changes on BMC environment.

Change-Id: I224918a8ddf2228c1752391fd07adf2bb93fe17c
Signed-off-by: Sridevi Ramesh <sridevra@in.ibm.com>
diff --git a/data/pldm_variables.py b/data/pldm_variables.py
index 61b0ea1..844c4bf 100755
--- a/data/pldm_variables.py
+++ b/data/pldm_variables.py
@@ -258,3 +258,6 @@
     "BIOSInteger",
     "BIOSEnumeration",
 ]
+
+PLDM_GET_PLDM_TYPES_RAW_CMD = "raw -d 0x80 0x00 0x04"
+PLDM_GET_PLDM_TYPES_RAW_CMD_OUTPUT = "00 00 04 00 1d 00 00 00 00 00 00 80"