tegra2: Add arch_cpu_init() to fire up Cortex-A9

We want to move away from a special Tegra2 start-up, and just use
arch_cpu_init() instead. However, if we run board_init_f() from boot
we need to build it for ARMv4T, since the Tegra's AVP start-up CPU
does not support ARMv7.

The effect of this is to do the AVP init earlier, and in
arch_cpu_init(), rather that board_early_init_f().

Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Warren <twarren@nvidia.com>

include/configs/tegra2-common.h

@@ -35,6 +35,7 @@
 
 #define CONFIG_SYS_CACHELINE_SIZE	32
 
+#define CONFIG_ARCH_CPU_INIT		/* Fire up the A9 core */
 #define CONFIG_ENABLE_CORTEXA9		/* enable CPU (A9 complex) */
 
 #include <asm/arch/tegra2.h>		/* get chip and board defs */