arm: at91: use macro to declare soc boot data

Instead of check the pointer of the init function, check the new builtin bool
to known if the soc is enabled.

This is needed as with the switch to the pinctrl the init will be NULL on pure
DT SoC.

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>

arch/arm/mach-at91/at91sam9261.c

@@ -334,10 +334,10 @@ static unsigned int at91sam9261_default_irq_priority[NR_AIC_IRQS] __initdata = {
 	0,	/* Advanced Interrupt Controller */
 };
 
-struct at91_init_soc __initdata at91sam9261_soc = {
+AT91_SOC_START(sam9261)
 	.map_io = at91sam9261_map_io,
 	.default_irq_priority = at91sam9261_default_irq_priority,
 	.ioremap_registers = at91sam9261_ioremap_registers,
 	.register_clocks = at91sam9261_register_clocks,
 	.init = at91sam9261_initialize,
-};
+AT91_SOC_END