staging: fix mei build when PM is not enabled

Fix mei build when CONFIG_PM is not enabled (i.e., fix typo):

drivers/staging/mei/main.c:1159: error: 'MEI_PM_OPS' undeclared here (not in a function)
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/mei/main.c

@@ -1145,7 +1145,7 @@ static int mei_pci_resume(struct device *device)
 static SIMPLE_DEV_PM_OPS(mei_pm_ops, mei_pci_suspend, mei_pci_resume);
 #define MEI_PM_OPS	(&mei_pm_ops)
 #else
-#define MIE_PM_OPS	NULL
+#define MEI_PM_OPS	NULL
 #endif /* CONFIG_PM */
 /*
  *  PCI driver structure