powerpc: Update xmon to use ppc_breakpoint_available()

The 'bd' command will now print an error and not set the breakpoint on
P9.

Signed-off-by: Michael Neuling <mikey@neuling.org>
[mpe: Unsplit quoted string]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Michael Neuling 2018-03-27 15:37:19 +11:00 • committed by Michael Ellerman
commit 9bc2bd5d9d