The seperation of the EISA init missed to include linux/io.h which breaks
the build with some special configurations.
Reported-by: NIngo Molnar <mingo@kernel.org>
Fixes: f7eaf6e0 ("x86/boot: Move EISA setup to a separate file")
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>