ipc_logging: Add ipc_logging extraction script

Add ipc_logging extraction script and documentation. This script is used
to extract IPC Logging data from memory dumps.

Change-Id: I5173ae394eea1d8f66592a73d61879fde4bb2e68

ipc_logging/readme.txt

+IPC Logging Extraction Script
+=============================
+
+Quick Start
+-----------
+To extract IPC logging info from RAM Dumps, use the script as follows:
+
+python ipc_logging.py parse <RAM dump 1> <RAM dump 2> <RAM dump N>
+
+This will give you just the parsed output. If you would also like to
+output each log page's data in binary format, along with more verbose
+output, use the -v option:
+
+python ipc_logging.py parse -v <RAM dump 1> <RAM dump 2> <RAM dump N>
+
+Before running the script, consult the load.cmm file from the crash dumps
+(if it is available) to make sure the dumps are contiguous and in the normal
+order, and modify the above commands as necessary. Run the script with no
+arguments for more usage information.
+
+If the load.cmm file is not available and the script cannot parse the dumps
+with the default command, contact asw.mp.linux for assistance.
+
+Advanced Usage
+--------------
+To see more usage options, run the ipc_logging.py with no arguments.