tools: Add show_memory script

show_memory is a simple tools that parse the blx.map files and print a
representation of the memory layout for the latest build.
This representation is based on standar

tools: Add show_memory script

show_memory is a simple tools that parse the blx.map files and print a
representation of the memory layout for the latest build.
This representation is based on standard symbols present on the map
files as: __TEXT_START/END__, __RODATA_START/END__, __STACKS_START/END__
, etc..

Change-Id: Iba3e301a1a9fee9a35abf1afdb69093617d33929
Signed-off-by: Louis Mayencourt <louis.mayencourt@arm.com>

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