acpi: Add a checksum to the DMAR table

This table lacks a correct checksum at present, so fix it.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/lib/acpi/acpi_table.c b/lib/acpi/acpi_table.c
index fd6156f..a80e164 100644
--- a/lib/acpi/acpi_table.c
+++ b/lib/acpi/acpi_table.c
@@ -66,6 +66,7 @@
 
 	dmar->host_address_width = info.address_width - 1;
 	dmar->flags = flags;
+	header->checksum = table_compute_checksum(dmar, header->length);
 
 	return 0;
 }