ACPI/IORT: Switch to use kmemdup_array()

Let the kememdup_array() take care about multiplication and possible
overflows.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Hanjun Guo <guohanjun@huawei.com>
Link: https://lore.kernel.org/r/20240606165005.3031490-1-andriy.shevchenko@linux.intel.com


Signed-off-by: Will Deacon <will@kernel.org>