ACPI/IORT: Fix doc warnings in iort.c

ACPI/IORT: Fix doc warnings in iort.c

Fix following warnings caused by mismatch between
function parameters and function comments.

drivers/acpi/arm64/iort.c:55: warning: Function parameter or member 'iort_node' not described in 'iort_set_fwnode'
drivers/acpi/arm64/iort.c:55: warning: Excess function parameter 'node' description in 'iort_set_fwnode'
drivers/acpi/arm64/iort.c:682: warning: Function parameter or member 'id' not described in 'iort_get_device_domain'
drivers/acpi/arm64/iort.c:682: warning: Function parameter or member 'bus_token' not described in 'iort_get_device_domain'
drivers/acpi/arm64/iort.c:682: warning: Excess function parameter 'req_id' description in 'iort_get_device_domain'
drivers/acpi/arm64/iort.c:1142: warning: Function parameter or member 'dma_size' not described in 'iort_dma_setup'
drivers/acpi/arm64/iort.c:1142: warning: Excess function parameter 'size' description in 'iort_dma_setup'
drivers/acpi/arm64/iort.c:1534: warning: Function parameter or member 'ops' not described in 'iort_add_platform_device'

Signed-off-by: Shiju Jose <shiju.jose@huawei.com>
Acked-by: Hanjun Guo <guohanjun@huawei.com>
Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Link: https://lore.kernel.org/r/20201014093139.1580-1-shiju.jose@huawei.com
Signed-off-by: Will Deacon <will@kernel.org>