ARM: omap2: fiq_debugger: ifdef local_timer_irqs in dump_irqs()

The local_timer_irqs field is surrounded by #ifdef
CONFIG_LOCAL_TIMERS in the irq_cpustat_t structure.  Do the same
for its usage in dump_irqs() so fiq_debugger can compile on
non-SMP systems.

Change-Id: Ie212d39b8c705f6815e00d86569bdb92b0c1e4c1
Signed-off-by: Scott Anderson <saa@google.com>
Signed-off-by: Ruslan Bilovol <ruslan.bilovol@ti.com>