cnss2: Extend register read/write debugfs

Extend register read/write debugfs with MMIO register access
options for debug purpose.

Change-Id: Ic67505698e24f16c1032b337dbb3dc918c12713e
Signed-off-by: Yue Ma <yuem@codeaurora.org>
diff --git a/drivers/net/wireless/cnss2/pci.h b/drivers/net/wireless/cnss2/pci.h
index e7da860..17c56d0 100644
--- a/drivers/net/wireless/cnss2/pci.h
+++ b/drivers/net/wireless/cnss2/pci.h
@@ -201,5 +201,9 @@
 int cnss_pcie_is_device_down(struct cnss_pci_data *pci_priv);
 int cnss_pci_suspend_bus(struct cnss_pci_data *pci_priv);
 int cnss_pci_resume_bus(struct cnss_pci_data *pci_priv);
+int cnss_pci_debug_reg_read(struct cnss_pci_data *pci_priv, u32 offset,
+			    u32 *val);
+int cnss_pci_debug_reg_write(struct cnss_pci_data *pci_priv, u32 offset,
+			     u32 val);
 
 #endif /* _CNSS_PCI_H */