ipmi: put acpi.h with the other headers

Enclosing '#include <linux/acpi.h>' within '#ifdef CONFIG_ACPI' is
unnecessary, since it has its own conditional compile for CONFIG_ACPI.

Commit 0fbcf4af ("ipmi: Convert the IPMI SI ACPI handling to a
platform device") exposed this as a problem for platforms that do not
support ACPI when it introduced a call to ACPI_PTR() macro outside of
the CONFIG_ACPI conditional compile. This would have been perfectly
acceptable if acpi.h were not conditionally excluded for the non-acpi
platform, because the conditional compile within acpi.h defines
ACPI_PTR() to return NULL when compiled for non acpi platforms.
Signed-off-by: Tony Camuso <tcamuso@redhat.com>

Fixed commit reference in header to conform to standard.
Signed-off-by: Corey Minyard <cminyard@mvista.com>

drivers/char/ipmi/ipmi_si_intf.c

@@ -68,6 +68,7 @@
 #include <linux/of_platform.h>
 #include <linux/of_address.h>
 #include <linux/of_irq.h>
+#include <linux/acpi.h>
 
 #ifdef CONFIG_PARISC
 #include <asm/hardware.h>	/* for register_parisc_driver() stuff */
@@ -2054,8 +2055,6 @@ static int hardcode_find_bmc(void)
 
 #ifdef CONFIG_ACPI
 
-#include <linux/acpi.h>
-
 /*
  * Once we get an ACPI failure, we don't try any more, because we go
  * through the tables sequentially.  Once we don't find a table, there