ACPI: add 'const' to several ACPI file_operations

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index 8e9c26a..7106606 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -1070,7 +1070,7 @@
 			   PDE(inode)->data);
 }
 
-static struct file_operations acpi_processor_power_fops = {
+static const struct file_operations acpi_processor_power_fops = {
 	.open = acpi_processor_power_open_fs,
 	.read = seq_read,
 	.llseek = seq_lseek,