fs_enet build breakage

Hi Kumar

Commit 4484079d517c2b6521621be0b1ea246ccc55c7d7 from your next branch
breaks my 8xx test config with the following error:

/home/benh/linux-powerpc-test/drivers/net/fs_enet/fs_enet-main.c: In function ‘setup_immap’:
/home/benh/linux-powerpc-test/drivers/net/fs_enet/fs_enet-main.c:947: error: ‘IMAP_ADDR’ undeclared (first use in this function)
/home/benh/linux-powerpc-test/drivers/net/fs_enet/fs_enet-main.c:947: error: (Each undeclared identifier is reported only once
/home/benh/linux-powerpc-test/drivers/net/fs_enet/fs_enet-main.c:947: error: for each function it appears in.)

I'm still pushing it with a bunch of other stuff to "test" so people get
to find more breakage but it will need to be fixed for the actual "next"
branch.

Cheers,
Ben.