of: provide of_n_{addr,size}_cells wrappers for !CONFIG_OF

The pci-rcar driver is enabled for compile tests, and this has shown that the driver cannot build without CONFIG_OF:

drivers/pci/host/pcie-rcar.c: In function 'pci_dma_range_parser_init':
drivers/pci/host/pcie-rcar.c:1039:2: error: implicit declaration of function 'of_n_addr_cells' [-Werror=implicit-function-declaration]
parser->pna = of_n_addr_cells(node);
^
As pointed out by Ben Dooks and Geert Uytterhoeven, this is actually
supposed to build fine, which we can achieve if we make the
declaration of of_irq_parse_and_map_pci conditional on CONFIG_OF
and provide an empty inline function otherwise, as we do for
a lot of other of interfaces.

This lets us build the rcar_pci driver again without CONFIG_OF for build testing. All platforms using this driver select OF, so this doesn't change anything for the users.

---
I originally sent the patch in 2014 when things initially broke and then forgot about while it was applied in my randconfig patch stack. I sent it again in 2016 without reply.

It's still broken and I think this is the correct fix.
v2: modify changelog as Geert suggested.

 include/linux/of.h | 3 +++
 1 file changed, 3 insertions(+)

index 4a8a70916237..1efdbe53136c 100644
@@ -735,6 +735,9 @@ static inline struct device_node *of_get_cpu_node(int cpu,
 	return NULL;
 }
 
+static inline int of_n_addr_cells(struct device_node *np) { return 0; }
+static inline int of_n_size_cells(struct device_node *np) { return 0; }
+
 static inline int of_property_read_u64(const struct device_node *np,
 				       const char *propname, u64 *out_value)
 {

2.9.0

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