Trim unnecessary includes

Signed-off-by: Blue Swirl <blauwirbel@gmail.com>

hw/acpi.c

@@ -17,8 +17,6 @@
  */
 #include "hw.h"
 #include "pc.h"
-#include "pci.h"
-#include "sysemu.h"
 #include "acpi.h"
 
 struct acpi_table_header

hw/acpi_piix4.c

@@ -20,9 +20,6 @@
 #include "apm.h"
 #include "pm_smbus.h"
 #include "pci.h"
-#include "sysemu.h"
-#include "i2c.h"
-#include "smbus.h"
 #include "acpi.h"
 
 //#define DEBUG

hw/apm.c

@@ -19,7 +19,6 @@
 
 #include "apm.h"
 #include "hw.h"
-#include "isa.h"
 
 //#define DEBUG
 

hw/pm_smbus.c

@@ -20,12 +20,7 @@
 #include "hw.h"
 #include "pc.h"
 #include "pm_smbus.h"
-#include "pci.h"
-#include "qemu-timer.h"
-#include "sysemu.h"
-#include "i2c.h"
 #include "smbus.h"
-#include "kvm.h"
 
 /* no save/load? */