parisc: Limit amount of kgdb breakpoints on parisc

kgdb is rarely used and 40 breakpoints seems enough to debug
parisc specific bugs.

Signed-off-by: Helge Deller <deller@gmx.de>

parisc: add KGDB support

This patch add KGDB support to PA-RISC. It also implements
single-stepping utilizing the recovery counter.

Signed-off-by: Sven Schnelle <svens@stackframe.org>
Signed-off-by: Helge Deller <deller@gmx.de>