pci: Use const for pci_find_device_id() etc.

These functions don't modify the device-ID struct that is passed in, so
mark the argument as const, so the data structure can be declared that
way. This allows it to be placed in the rodata section.
Signed-off-by: NSimon Glass <sjg@chromium.org>
Reviewed-by: NBin Meng <bmeng.cn@gmail.com>

drivers/pci/pci-uclass.c

@@ -164,7 +164,7 @@ int dm_pci_bus_find_bdf(pci_dev_t bdf, struct udevice **devp)
 }
 
 static int pci_device_matches_ids(struct udevice *dev,
-				  struct pci_device_id *ids)
+				  const struct pci_device_id *ids)
 {
 	struct pci_child_plat *pplat;
 	int i;
@@ -181,7 +181,7 @@ static int pci_device_matches_ids(struct udevice *dev,
 	return -EINVAL;
 }
 
-int pci_bus_find_devices(struct udevice *bus, struct pci_device_id *ids,
+int pci_bus_find_devices(struct udevice *bus, const struct pci_device_id *ids,
 			 int *indexp, struct udevice **devp)
 {
 	struct udevice *dev;
@@ -201,7 +201,7 @@ int pci_bus_find_devices(struct udevice *bus, struct pci_device_id *ids,
 	return -ENODEV;
 }
 
-int pci_find_device_id(struct pci_device_id *ids, int index,
+int pci_find_device_id(const struct pci_device_id *ids, int index,
 		       struct udevice **devp)
 {
 	struct udevice *bus;

include/pci.h

@@ -1064,7 +1064,7 @@ int pci_get_ff(enum pci_size_t size);
  * @devp:	Returns matching device if found
  * @return 0 if found, -ENODEV if not
  */
-int pci_bus_find_devices(struct udevice *bus, struct pci_device_id *ids,
+int pci_bus_find_devices(struct udevice *bus, const struct pci_device_id *ids,
 			 int *indexp, struct udevice **devp);
 
 /**
@@ -1076,7 +1076,7 @@ int pci_bus_find_devices(struct udevice *bus, struct pci_device_id *ids,
  * @devp:	Returns matching device if found
  * @return 0 if found, -ENODEV if not
  */
-int pci_find_device_id(struct pci_device_id *ids, int index,
+int pci_find_device_id(const struct pci_device_id *ids, int index,
 		       struct udevice **devp);
 
 /**