Stop overloading opt_global.h.

sys/conf/options

@@ -899,7 +899,7 @@ RCTL		opt_global.h
 # At least one of the AR71XX ubiquiti boards has a Redboot configuration
 # that "lies" about the amount of RAM it has. Until a cleaner method is
 # defined, this option will suffice in overriding what Redboot says.
-AR71XX_REALMEM    opt_global.h
-AR71XX_ENV_UBOOT	opt_global.h
-AR71XX_ENV_REDBOOT	opt_global.h
-AR71XX_ATH_EEPROM	opt_global.h
+AR71XX_REALMEM		opt_ar71xx.h
+AR71XX_ENV_UBOOT	opt_ar71xx.h
+AR71XX_ENV_REDBOOT	opt_ar71xx.h
+AR71XX_ATH_EEPROM	opt_ar71xx.h

sys/mips/atheros/ar71xx_machdep.c

@@ -28,6 +28,7 @@
 __FBSDID("$FreeBSD$");
 
 #include "opt_ddb.h"
+#include "opt_ar71xx.h"
 
 #include <sys/param.h>
 #include <sys/conf.h>

sys/mips/atheros/ar71xx_pci.c

@@ -28,6 +28,8 @@
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD$");
 
+#include "opt_ar71xx.h"
+
 #include <sys/param.h>
 #include <sys/systm.h>