i2c: amd8111: switch to devm_ functions

i2c: amd8111: switch to devm_ functions

Use devm_kzalloc() to manage the memory allocation of the smbus structure
and devm_request_region() to manage the I/O port region.

This simplifies the error handling paths in the probe function by removing
manual cleanup and allows for the removal of the explicit cleanup in the
remove function.

Signed-off-by: Filippo Muscherà <filippo.muschera@gmail.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Link: https://lore.kernel.org/r/20260202131304.8524-2-filippo.muschera@gmail.com