i2c: i801: Switch to iomapped register access

JIRA: https://issues.redhat.com/browse/RHEL-113184

commit 4a3f77e
Author: Heiner Kallweit <hkallweit1@gmail.com>
Date:   Wed Mar 12 20:07:23 2025 +0100

    i2c: i801: Switch to iomapped register access

    Switch to iomapped register access as a prerequisite for adding
    support for MMIO register access.

    This changes replaces the delayed inb_p()/outb_p() calls with calls to
    ioread8()/iowrite8() which don't have this extra delay. According to
    Documentation/driver-api/device-io.rst the _p versions are needed
    for ISA device access only, therefore switching to the non-delayed
    versions should not cause problems. However a certain risk remains,
    which on the other hand is significantly reduced by the fact that
    recent systems will use MMIO instead of PIO. ICH7 datasheet from 2012
    mentions already that SMBus register space is also memory-mapped.
    So all systems from at least the last 10 yrs should be safe.

    Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
    Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
    Link: https://lore.kernel.org/r/67535b17-c3fb-4507-b083-9c1884b4dd7d@gmail.com

Signed-off-by: Steve Best <sbest@redhat.com>

Author: sfbest