MIPS: CPS: Early debug using an ns16550-compatible UART

Provide support for outputting early debug information, in the form of
various register values should an exception occur, during the early
bringup of secondary cores. This code requires an ns16550-compatible
UART accessible from the secondary core, and is written in assembly due
to the environment in which such early exceptions occur where way may
not have a stack, be coherent or even have initialised caches.

[[email protected]: Fix merge conflict.]

Signed-off-by: Paul Burton <[email protected]>
Cc: [email protected]
Cc: Steven J. Hill <[email protected]>
Cc: Andrew Bresticker <[email protected]>
Cc: Leonid Yegoshin <[email protected]>
Cc: Maciej W. Rozycki <[email protected]>
Cc: Jason Cooper <[email protected]>
Cc: [email protected]
Cc: James Hogan <[email protected]>
Cc: Markos Chandras <[email protected]>
Patchwork: https://patchwork.linux-mips.org/patch/11202/
Signed-off-by: Ralf Baechle <[email protected]>

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