ACPI: replace remaining __FUNCTION__ occurrences

__FUNCTION__ is gcc-specific, use __func__

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index 12cce69..d64a142 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -1201,7 +1201,7 @@
 	if (!video)
 		goto end;
 
-	printk(KERN_INFO PREFIX "Please implement %s\n", __FUNCTION__);
+	printk(KERN_INFO PREFIX "Please implement %s\n", __func__);
 	seq_printf(seq, "<TODO>\n");
 
       end: