sc16is7xx: Set iobase to device index

[ Upstream commit 5da6b1c079e6804a81e63ab8337224cbd2148c91 ]

Some derivates of sc16is7xx devices expose more than one tty device to
userspace. If multiple such devices exist in a system, userspace
currently has no clean way to infer which tty maps to which physical
line.

Set the .iobase value to the relative index within the device to allow
infering the order through sysfs.

Signed-off-by: Daniel Mack <daniel@zonque.org>
Link: https://lore.kernel.org/r/20200901120329.4176302-1-daniel@zonque.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Stable-dep-of: 2861ed4d6e6d ("serial: sc16is7xx: fix broken port 0 uart init")
Signed-off-by: Sasha Levin <sashal@kernel.org>