These are kernel updates for the NMI/KDB handler on the SGI
Ultraviolet System.
* Fix problem where 'quit' to more> prompt doesn't stop output.
* Fix problem where reg dump shows letter 'd' in first column of
every line.
* Up the number of LINES so the entire entry message is displayed.
* Moves KDB header defines to externally visable header so external
KDB modules can be built.
* Exports some significant KDB functions for use by external modules.
* Consolidates the '| grep' support into new kdb_grep.c file.
* Updates kdb grep support to add some new options.
* Restablishes support for kdump from the kdb prompt.
* Adds back in the 'pshelp' command.
* Adds new entry into KGDB for systems with global NMI support.
* Adds new reason code to enter KDB that's not considered an error.
* Adds support for external 'uvtrace' module.
* Updates NMI support for new internal system (SMM) NMI handler.
* Adds back the capability of NMI entering KDB/KGDB.
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