ACPI: Make DMAR flags settable

Add a parameter to acpi_create_dmar() for the flags field and define
flags given by the spec [1].

[1] Intel Virtualization Technology for Directed I/O
    Architecture Specification
    Document-Number: D51397

Change-Id: I03ae32f13bb0061bd3b9bef607db175d9b0bc5e1
Signed-off-by: Nico Huber <nico.huber@secunet.com>
Reviewed-on: http://review.coreboot.org/12191
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins)
Reviewed-by: Duncan Laurie <dlaurie@google.com>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
diff --git a/src/northbridge/intel/gm45/acpi.c b/src/northbridge/intel/gm45/acpi.c
index 5140b9c..21a8cd5 100644
--- a/src/northbridge/intel/gm45/acpi.c
+++ b/src/northbridge/intel/gm45/acpi.c
@@ -116,7 +116,7 @@
 
 	printk(BIOS_DEBUG, "ACPI:     * DMAR\n");
 	dmar = (acpi_dmar_t *) current;
-	acpi_create_dmar(dmar, acpi_fill_dmar);
+	acpi_create_dmar(dmar, 0, acpi_fill_dmar);
 	current += dmar->header.length;
 	ALIGN_CURRENT;
 	acpi_add_table(rsdp, dmar);