The 'flash banks' command produces a list that needs to be formatted
properly for GDB's 'mem info' to work properly. The flash_banks TCL
wrapper provided this formatting, but wrappers no longer work for
second-level commands as they did in the past. With this patch,
the 'flash_banks' command can be used with the new command syntax
and display the required information.
Moves definitions for each layer into their own file, eliminating
layering violations in the built-in TCL code. Updates src/Makefile.am
rules to include all files in the final startup.tcl input file, and
others Makefile.am rules to distribute the new files in our packages.
