[PATCH][2.6.12-rc1-mm1] fix compile error in ppc64 prom.c

[Paul Mackerras]

Mikael Pettersson writes:

> Compiling 2.6.12-rc1-mm1 for ppc64 fails with:
> 
> arch/ppc64/kernel/prom.c:1691: error: syntax error before 'prom_reconfig_notifier'

Currently prom.c is in a mess because Linus applied the last 2 of 8
patches from Nathan Lynch but not the first 6.  :-P

Paul.