ipmi: Remove ACPI SPMI probing from the SSIF (I2C) driver

ipmi: Remove ACPI SPMI probing from the SSIF (I2C) driver

The IPMI spec states:

  The purpose of the SPMI Table is to provide a mechanism that can
  be used by the OSPM (an ACPI term for “OS Operating System-directed
  configuration and Power Management” essentially meaning an ACPI-aware
  OS or OS loader) very early in the boot process, e.g., before the
  ability to execute ACPI control methods in the OS is available.

When we are probing IPMI in Linux, ACPI control methods are available,
so we shouldn't be probing using SPMI.  It could cause some confusion
during the probing process.

BugLink: http://launchpad.net/bugs/1799276
Signed-off-by: Corey Minyard <cminyard@mvista.com>
Tested-by: Jiandi An <anjiandi@codeaurora.org>
(cherry picked from commit 4866b1dce0389013a268f0ab63f7229b30c6e5fe)
Signed-off-by: Manoj Iyer <manoj.iyer@canonical.com>
Acked-by: Kleber Souza <kleber.souza@canonical.com>
Acked-by: Stefan Bader <stefan.bader@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>