hw: move private headers to hw/ subdirectories.

Many headers are used only in a single directory.  These can be
kept in hw/.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

hw/i2c/bitbang_i2c.c

@@ -10,7 +10,7 @@
  * GNU GPL, version 2 or (at your option) any later version.
  */
 #include "hw/hw.h"
-#include "hw/bitbang_i2c.h"
+#include "bitbang_i2c.h"
 #include "hw/sysbus.h"
 
 //#define DEBUG_BITBANG_I2C

hw/i2c/bitbang_i2c.h

@@ -0,0 +1,14 @@
+#ifndef BITBANG_I2C_H
+#define BITBANG_I2C_H
+
+#include "hw/i2c/i2c.h"
+
+typedef struct bitbang_i2c_interface bitbang_i2c_interface;
+
+#define BITBANG_I2C_SDA 0
+#define BITBANG_I2C_SCL 1
+
+bitbang_i2c_interface *bitbang_i2c_init(i2c_bus *bus);
+int bitbang_i2c_set(bitbang_i2c_interface *i2c, int line, int level);
+
+#endif

hw/i2c/versatile_i2c.c

@@ -22,7 +22,7 @@
  */
 
 #include "hw/sysbus.h"
-#include "hw/bitbang_i2c.h"
+#include "bitbang_i2c.h"
 
 typedef struct {
     SysBusDevice busdev;