x86/acpi: simplify updating header checksum

Use acpi_update_checksum() for updating ACPI table header checksum.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Matthias Brugger <mbrugger@suse.com>
diff --git a/arch/x86/lib/acpi_nhlt.c b/arch/x86/lib/acpi_nhlt.c
index 880ef31..8aae5fa 100644
--- a/arch/x86/lib/acpi_nhlt.c
+++ b/arch/x86/lib/acpi_nhlt.c
@@ -414,7 +414,7 @@
 	cur.start = (void *)header;
 	nhlt_serialise_endpoints(nhlt, &cur);
 
-	header->checksum = table_compute_checksum(header, sz);
+	acpi_update_checksum(header);
 	nhlt_free_resources(nhlt);
 	assert(cur.buf - cur.start == sz);