mfd: rtsx: Clear hardware PFM mode in rtl8411b

Clear hw_pfm_en to disable hardware PFM mode, to fix a bug that in some
situation registers in 0xFDxx domain can't be accessed.

Signed-off-by: Wei WANG <wei_wang@realsil.com.cn>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
diff --git a/include/linux/mfd/rtsx_pci.h b/include/linux/mfd/rtsx_pci.h
index 11ab786..9a16276 100644
--- a/include/linux/mfd/rtsx_pci.h
+++ b/include/linux/mfd/rtsx_pci.h
@@ -687,6 +687,7 @@
 #define PME_FORCE_CTL			0xFE56
 #define ASPM_FORCE_CTL			0xFE57
 #define PM_CLK_FORCE_CTL		0xFE58
+#define FUNC_FORCE_CTL			0xFE59
 #define PERST_GLITCH_WIDTH		0xFE5C
 #define CHANGE_LINK_STATE		0xFE5B
 #define RESET_LOAD_REG			0xFE5E