[ioapi] Remove old io.h file and switch all users over to <gpxe/io.h>

src/arch/i386/core/i386_timer.c

@@ -14,7 +14,7 @@
 #include <stddef.h>
 #include <bits/timer2.h>
 #include <gpxe/timer.h>
-#include <io.h>
+#include <gpxe/io.h>
 
 /* Timers tick over at this rate */
 #define TIMER2_TICK_RATE	1193180U

src/arch/i386/core/relocate.c

@@ -1,4 +1,4 @@
-#include <io.h>
+#include <gpxe/io.h>
 #include <registers.h>
 #include <gpxe/memmap.h>
 

src/arch/i386/core/video_subr.c

@@ -7,7 +7,7 @@
 
 #include "stddef.h"
 #include "string.h"
-#include "io.h"
+#include <gpxe/io.h>
 #include "console.h"
 #include <gpxe/init.h>
 #include "vga.h"