Mainline Builds enables Staging

[Andy Whitcroft]

It has been sensibly suggested that we should be enabling the staging
portion of the upstream kernels as we use some staging drivers in
Ubuntu, and because a valid use case is testing those drivers in advance
of them being enabled for Ubuntu.

To this end the Mainline kernel builds from v2.6.30-rc5 onwards have
CONFIG_STAGING enabled.  At the moment we are accepting the default
setting for each of the drivers within staging.  Based on the (possibly
nieve) assumption that drivers which are in a compilable state are
enabled by default and those which are dodgy are not.  This has enabled
about 6 of the drivers in staging at this time.

-apw