[SPARC64]: envctrl.c needs asm/io.h

Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/sbus/char/envctrl.c

@@ -30,6 +30,7 @@
 #include <asm/ebus.h>
 #include <asm/uaccess.h>
 #include <asm/envctrl.h>
+#include <asm/io.h>
 
 #define ENVCTRL_MINOR	162