sh/irq: Use accessor irq_data_get_node()

Use accessor irq_data_get_node() to hide struct irq_data
implementation detail, so we can move irq_data->node to
irq_data_common once all usage sites are fixed.

Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Cc: Simon Horman <horms@verge.net.au>
Cc: Magnus Damm <magnus.damm@gmail.com>
Link: http://lkml.kernel.org/r/20150713151626.519112900@linutronix.de


Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>