src/acpi/acpigen.c: Use macro for access_size

Change-Id: I677d055b3cd47f760d743a6ecb63cb5738274090
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/42727
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
diff --git a/src/acpi/acpigen.c b/src/acpi/acpigen.c
index a4a74f6..f218706 100644
--- a/src/acpi/acpigen.c
+++ b/src/acpi/acpigen.c
@@ -687,7 +687,7 @@
 		.space_id    = ACPI_ADDRESS_SPACE_FIXED,
 		.bit_width   = 0,
 		.bit_offset  = 0,
-		.access_size = 0,
+		.access_size = ACPI_ACCESS_SIZE_UNDEFINED,
 		.addrl       = 0,
 		.addrh       = 0,
 	};
@@ -1553,7 +1553,7 @@
 	for (i = 0; i < max; ++i) {
 		const acpi_addr_t *reg = &(config->regs[i]);
 		if (reg->space_id == ACPI_ADDRESS_SPACE_MEMORY &&
-		    reg->bit_width == 32 && reg->access_size == 0) {
+		    reg->bit_width == 32 && reg->access_size == ACPI_ACCESS_SIZE_UNDEFINED) {
 			acpigen_write_dword(reg->addrl);
 		} else {
 			acpigen_write_register_resource(reg);