i2c: aspeed: Remove unused includes

No symbols from the linux/irqchip/chained_irq.h and linux/irqdomain.h
headers are used in the driver, so they can be removed.

Signed-off-by: Thierry Reding <treding@nvidia.com>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Wolfram Sang <wsa@kernel.org>