fb: pvr2fb: A few more __devinit annotations for PCI.

In the PCI + hotplug case we end up with some bogus references between
the PCI driver path and the DC path. In order to fix this, we have to
rework the common init path for __devinit, as well as moving all of the
data that it references to __devinidata.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>