[PATCH] powerpc: remove default=y from PMAC and CHRP Kconfigs

[Paul Mackerras]

Timur Tabi writes:

> I'm waiting for someone to explain to me what's so special about CHRP
> and PMAC that these two platforms should be enabled by default, when
> all other PowerPC platforms are disabled by default.

Historically they have been the most important 32-bit platforms, along
with PReP.

The problem with making all platforms default to N is that if you take
the default values for all config options you end up with a config
that won't build.  So we want at least one platform to default to Y,
and pmac has been as good a choice as any for that (and probably still
is).

Paul.