* Change the fix for 'KDB not defined' build problem by changing
the kgdb_nmicallin() interface to include the KDB specific
reason code. This removes the dependency on KDB in the debug
core. It also requires a change to the kgdb call in from UV
NMI handler to avoid a compile error.
* Fix some problems found by the kbuild test robot.
* Fix UV call into kgdb to depend only on whether KGDB is defined
and not both KGDB and KDB. This allows the power nmi command
to use the gdb remote connection if enabled. Note new action
of 'kgdb' needs to be set as well to indicate user wants the
kernel to wait for gdb to be connected. If it's set to 'kdb'
then an error message is displayed if KDB is not configured.
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