usb: cdns3: fix build when PM_SLEEP is not set

Fix build error when CONFIG_PM_SLEEP is not enabled by adding
stubs for the PM_SLEEP functions.

../drivers/usb/cdns3/cdns3-plat.c: In function ‘cdns3_controller_resume’:
../drivers/usb/cdns3/cdns3-plat.c:246:2: error: implicit declaration of function ‘cdns_resume’; did you mean ‘cdns_remove’? [-Werror=implicit-function-declaration]
  cdns_resume(cdns, !PMSG_IS_AUTO(msg));
  ^~~~~~~~~~~
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Peter Chen <peter.chen@nxp.com>
Cc: Pawel Laszczak <pawell@cadence.com>
Cc: Roger Quadros <rogerq@ti.com>
Cc: linux-usb@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Peter Chen <peter.chen@nxp.com>

drivers/usb/cdns3/core.h

@@ -127,5 +127,10 @@ int cdns_remove(struct cdns *cdns);
 #ifdef CONFIG_PM_SLEEP
 int cdns_resume(struct cdns *cdns, u8 set_active);
 int cdns_suspend(struct cdns *cdns);
+#else /* CONFIG_PM_SLEEP */
+static inline int cdns_resume(struct cdns *cdns, u8 set_active)
+{ return 0; }
+static inline int cdns_suspend(struct cdns *cdns)
+{ return 0; }
 #endif /* CONFIG_PM_SLEEP */
 #endif /* __LINUX_CDNS3_CORE_H */