wrdd: Export WRDD info in the header

Export the WRDD spec revision and WiFi domain type in the header
file so it can be used to generate ACPI tables by wifi drivers.

Change-Id: I3222eca723c52fe74a004aa7bac7167264249fd1
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: https://review.coreboot.org/15018
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/include/wrdd.h

@@ -18,6 +18,12 @@
 
 #include <stdint.h>
 
+/* WRDD Spec Revision */
+#define WRDD_REVISION 0x0
+
+/* Domain type */
+#define WRDD_DOMAIN_TYPE_WIFI 0x7
+
 /* Default regulatory domain ID */
 #define WRDD_DEFAULT_REGULATORY_DOMAIN 0x4150
 /* INDONESIA regulatory domain ID */