sh: intc: Remove pointless irq_reserve_irqs() invocation

sh: intc: Remove pointless irq_reserve_irqs() invocation

The preceding call to irq_create_identity_mapping() marks the
interrupt as allocated already. Remove the leftover.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Grant Likely <grant.likely@linaro.org>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Acked-by: Simon Horman <horms@verge.net.au>
Cc: linux-sh@vger.kernel.org
Link: http://lkml.kernel.org/r/20140507154339.189047829@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>