ectool: Support OpenBSD

Adds checks for OpenBSD in all the places that were already checking for
NetBSD. This fixes e.g.:

    ec.c:21:20: error: sys/io.h: No such file or directory

which was caused by defaulting to Linux.

Also, OpenBSD calls its amd64 iopl amd64_iopl instead of x86_64_iopl.
This change just defines iopl appropriately depending on the
OS and architecture.

TEST=Build on OpenBSD 6.0 or -current from 2017-01-25.

Change-Id: If6d92a9850c15cd9f8e287cc4f963d3ff881f72c
Signed-off-by: Steven Dee <i@wholezero.org>
Reviewed-on: https://review.coreboot.org/18260
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>

util/ectool/ectool.c

@@ -18,14 +18,24 @@
 #include <stdlib.h>
 #include <unistd.h>
 #include <getopt.h>
-#ifndef __NetBSD__
+#if !(defined __NetBSD__ || defined __OpenBSD__)
 #include <sys/io.h>
 #endif
 #include <ec.h>
 #include <stdlib.h>
 
-#ifdef __NetBSD__
+#if defined __NetBSD__ || defined __OpenBSD__
+
 #include <machine/sysarch.h>
+
+# if defined __i386__
+#  define iopl i386_iopl
+# elif defined __NetBSD__
+#  define iopl x86_64_iopl
+# else
+#  define iopl amd64_iopl
+# endif
+
 #endif
 
 
@@ -113,15 +123,7 @@ int main(int argc, char *argv[])
 		}
 	}
 
-#ifdef __NetBSD__
-# ifdef __i386__
-	if (i386_iopl(3)) {
-# else
-	if (x86_64_iopl(3)) {
-# endif
-#else
 	if (iopl(3)) {
-#endif
 		printf("You need to be root.\n");
 		exit(1);
 	}