of: address: Store number of bus flag cells rather than bool

It is more useful to know how many flags cells a bus has rather than
whether a bus has flags or not as ultimately the number of cells is the
information used. Replace 'has_flags' boolean with 'flag_cells' count.

Acked-by: Herve Codina <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Rob Herring <[e-mail]>

drivers/of/address.c

···
 	u64		(*map)(__be32 *addr, const __be32 *range,
 				int na, int ns, int pna);
 	int		(*translate)(__be32 *addr, u64 offset, int na);
-	bool	has_flags;
+	int		flag_cells;
 	unsigned int	(*get_flags)(const __be32 *addr);
 };
 
···
 		.count_cells = of_bus_pci_count_cells,
 		.map = of_bus_pci_map,
 		.translate = of_bus_default_flags_translate,
-		.has_flags = true,
+		.flag_cells = 1,
 		.get_flags = of_bus_pci_get_flags,
 	},
 #endif /* CONFIG_PCI */
···
 		.count_cells = of_bus_isa_count_cells,
 		.map = of_bus_isa_map,
 		.translate = of_bus_default_flags_translate,
-		.has_flags = true,
+		.flag_cells = 1,
 		.get_flags = of_bus_isa_get_flags,
 	},
 	/* Default with flags cell */
···
 		.count_cells = of_bus_default_count_cells,
 		.map = of_bus_default_flags_map,
 		.translate = of_bus_default_flags_translate,
-		.has_flags = true,
+		.flag_cells = 1,
 		.get_flags = of_bus_default_flags_get_flags,
 	},
 	/* Default */
···
 	int na = parser->na;
 	int ns = parser->ns;
 	int np = parser->pna + na + ns;
-	int busflag_na = 0;
+	int busflag_na = parser->bus->flag_cells;
 
 	if (!range)
 		return NULL;
···
 		return NULL;
 
 	range->flags = parser->bus->get_flags(parser->range);
-
-	/* A extra cell for resource flags */
-	if (parser->bus->has_flags)
-		busflag_na = 1;
 
 	range->bus_addr = of_read_number(parser->range + busflag_na, na - busflag_na);