goldfish: fix >> 32 warning

We should be checking for a 64bit platform not 64bit DMA address types in
the case of Goldfish. The Goldfish virtual platform is either 32/32 or
64/64.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>