PCI/MSI: Rename __read_msi_msg() to __pci_read_msi_msg()

Rename __read_msi_msg() to __pci_read_msi_msg() and kill unused
read_msi_msg(). It's a preparation to separate generic MSI code from
PCI core.

Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Grant Likely <grant.likely@linaro.org>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Yingjoe Chen <yingjoe.chen@mediatek.com>
Cc: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
diff --git a/include/linux/msi.h b/include/linux/msi.h
index 6704991..f36c37b 100644
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -16,12 +16,11 @@
 struct msi_desc;
 void mask_msi_irq(struct irq_data *data);
 void unmask_msi_irq(struct irq_data *data);
-void __read_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
 void __get_cached_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
 void __write_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
-void read_msi_msg(unsigned int irq, struct msi_msg *msg);
 void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg);
 void write_msi_msg(unsigned int irq, struct msi_msg *msg);
+
 u32 __msix_mask_irq(struct msi_desc *desc, u32 flag);
 u32 __msi_mask_irq(struct msi_desc *desc, u32 mask, u32 flag);
 
@@ -51,6 +50,8 @@
 	struct msi_msg msg;
 };
 
+void __pci_read_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
+
 /*
  * The arch hooks to setup up msi irqs. Those functions are
  * implemented as weak symbols so that they /can/ be overriden by