i2c: Re-enable piix4 driver on non-x86

i2c: Re-enable piix4 driver on non-x86

loongarch and mips both support hardware that uses the i2c-piix4 driver.
It should not be restricted to x86, so drop the x86 dependency.

Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Closes: https://lore.kernel.org/all/CAMuHMdVPQLjOox5sMp34Z5MTwKv2WOpHa=MpZr8hWG22fQKcjw@mail.gmail.com/
Fixes: 7e173eb82ae97175 ("i2c: piix4: Make CONFIG_I2C_PIIX4 dependent on CONFIG_X86").
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Reviewed-by: Hans de Goede <hansg@kernel.org>
Acked-by: Andi Shyti <andi.shyti@kernel.org>
Link: https://lore.kernel.org/r/20250610205817.3912944-2-superm1@kernel.org
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>