lrdp-v2: Add symbol parsing for loadable modules

Current Linux Ram Dump Paser scripts are only able to load kernel
symbols by default. No loadable modules' symbols will be parsed
at startup time, which may result in 'unknown symbols' in some
cases, especially when checking SLAB info on dual-wifi platforms.

With this change, loadable modules' symbols can be parsed on
script startup by the following configurations:

1) Put all symbols under a certain dir, such as:

<dump_location>/symbols/wlan.ko
<dump_location>/symbols/wlan_sdio.ko

2) Add --sym_path when invoking the scripts, such as:

python %RAM_DUMP_PARSER_PATH%\ramparse.py --sym_path
<dump_location>/symbols

With the above actions, all loadable modules' symbols will be
parsed and stored for subsequent information dumping. Symbol
loading commands will also be added into the Trace32 startup
script.

Change-Id: Idda9c9a08cfd24c19bf4021e80fee5187cd031b9