i2c: revert "i2c: core: Allow drivers to disable i2c-core irq mapping"

This manually reverts commit d1d84bb9.
The only user has gone two years ago with commit 589edb56 ("ACPI /
scan: Create platform device for INT33FE ACPI nodes") and no new user
has showed up. Remove and hope we will never need it again.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>