ARM: mmp: remove NR_IRQS

Remove NR_IRQS and add a per machine .nr_irqs setting. Clean-up namespace
replacing usage of IRQ_BOARD_START with MMP_NR_IRQS.

Signed-off-by: Rob Herring <rob.herring@calxeda.com>
diff --git a/arch/arm/mach-mmp/brownstone.c b/arch/arm/mach-mmp/brownstone.c
index d839fe6..5cb769c 100644
--- a/arch/arm/mach-mmp/brownstone.c
+++ b/arch/arm/mach-mmp/brownstone.c
@@ -28,7 +28,7 @@
 
 #include "common.h"
 
-#define BROWNSTONE_NR_IRQS	(IRQ_BOARD_START + 40)
+#define BROWNSTONE_NR_IRQS	(MMP_NR_IRQS + 40)
 
 #define GPIO_5V_ENABLE		(89)
 
@@ -158,7 +158,7 @@
 };
 
 static struct max8925_platform_data brownstone_max8925_info = {
-	.irq_base		= IRQ_BOARD_START,
+	.irq_base		= MMP_NR_IRQS,
 };
 
 static struct i2c_board_info brownstone_twsi1_info[] = {