acpi_table_header: Replace hard-coded revision via macro and function

Minimize use of hard-coded value for acpi_table_header->revision to soft
code. Replace with macro defined in arch/acpi.h for FADT and with the
get_acpi_table_revision function for SSDT.

Change-Id: I99e59afc1a87203499d2da6dedaedfa643ca7eac
Signed-off-by: Sourabh Kashyap <Sourabhka@hcl.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/35539
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/southbridge/intel/i82371eb/fadt.c b/src/southbridge/intel/i82371eb/fadt.c
index 9515c01..26a1570 100644
--- a/src/southbridge/intel/i82371eb/fadt.c
+++ b/src/southbridge/intel/i82371eb/fadt.c
@@ -39,7 +39,7 @@
 	memset((void *) fadt, 0, sizeof(acpi_fadt_t));
 	memcpy(header->signature, "FACP", 4);
 	header->length = 244;
-	header->revision = 1;
+	header->revision = ACPI_FADT_REV_ACPI_1_0;
 	memcpy(header->oem_id, OEM_ID, 6);
 	memcpy(header->oem_table_id, ACPI_TABLE_CREATOR, 8);
 	memcpy(header->asl_compiler_id, ASLC, 4);