platform/x86: ISST: Check for unaligned mmio address

The address should be aligned to 4 byte boundary. So send an error for
unaligned address.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Link: https://lore.kernel.org/r/20201204015746.1168941-1-srinivas.pandruvada@linux.intel.com


Signed-off-by: Hans de Goede <hdegoede@redhat.com>