Debugger: Echo actual command for "unknown command" message.

Output is now: <command>: unknown command
Provides some additional information, especially if line-editing
is involved.
Deploy ACPI_EXPORT_SYMBOL_INIT for main ACPICA initialization interfaces.

This change adds a new macro for the main init and terminate external
interfaces in order to support hosts that require additional or different
processing for these functions. Changed from ACPI_EXPORT_SYMBOL to
ACPI_EXPORT_SYMBOL_INIT. Lv Zheng, Bob Moore.