mwifiex: fix [-Wunused-function] warnings on pcie suspend/resume

drivers/net/wireless/mwifiex/pcie.c:204:12: warning:
  'mwifiex_pcie_resume' defined but not used [-Wunused-function]
drivers/net/wireless/mwifiex/pcie.c:166:12: warning:
  'mwifiex_pcie_suspend' defined but not used [-Wunused-function]

The suspend/resume handlers ought to be under CONFIG_PM directive.

Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/mwifiex/pcie.c b/drivers/net/wireless/mwifiex/pcie.c
index f7e8c73..cf7bdf4 100644
--- a/drivers/net/wireless/mwifiex/pcie.c
+++ b/drivers/net/wireless/mwifiex/pcie.c
@@ -76,6 +76,7 @@
 	return false;
 }
 
+#ifdef CONFIG_PM
 /*
  * Kernel needs to suspend all functions separately. Therefore all
  * registered functions must have drivers with suspend and resume
@@ -149,6 +150,7 @@
 
 	return 0;
 }
+#endif
 
 /*
  * This function probes an mwifiex device and registers it. It allocates