ARM: consolidate SMP cross call implementation

Rather than having each platform class provide a mach/smp.h header for
smp_cross_call(), arrange for them to register the function with the
core ARM SMP code instead.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/mach-tegra/platsmp.c b/arch/arm/mach-tegra/platsmp.c
index ec1f689..b8ae3c9 100644
--- a/arch/arm/mach-tegra/platsmp.c
+++ b/arch/arm/mach-tegra/platsmp.c
@@ -20,6 +20,7 @@
 #include <linux/io.h>
 
 #include <asm/cacheflush.h>
+#include <asm/hardware/gic.h>
 #include <mach/hardware.h>
 #include <asm/mach-types.h>
 #include <asm/smp_scu.h>
@@ -122,6 +123,8 @@
 
 	for (i = 0; i < ncores; i++)
 		cpu_set(i, cpu_possible_map);
+
+	set_smp_cross_call(gic_raise_softirq);
 }
 
 void __init platform_smp_prepare_cpus(unsigned int max_cpus)