ARM: orion: use SPARSE_IRQ everywhere

As a preparation for multiplatform support, this moves all the
code using plat-orion over to use sparse irq support, which is
enabled implicitly for multiplatform.

In particular, the hardcoded NR_IRQS macro gets replaced with
a machine specific one that is set in the machine descriptor
in order to set up a static mapping for all legacy interrupts.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
diff --git a/arch/arm/mach-dove/dove-db-setup.c b/arch/arm/mach-dove/dove-db-setup.c
index 76e26f9..bcb678f 100644
--- a/arch/arm/mach-dove/dove-db-setup.c
+++ b/arch/arm/mach-dove/dove-db-setup.c
@@ -94,6 +94,7 @@
 
 MACHINE_START(DOVE_DB, "Marvell DB-MV88AP510-BP Development Board")
 	.atag_offset	= 0x100,
+	.nr_irqs	= DOVE_NR_IRQS,
 	.init_machine	= dove_db_init,
 	.map_io		= dove_map_io,
 	.init_early	= dove_init_early,