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IRQ module updated to send SIGUSR2 instead of SIGUSR1.
SDE 9.4.0 adds setup_async_signal_handling_thread() for processing SIGUSR1 and other signals.
In original design of BSP, it’s to use SIGUSR1 for bf_pltfm_irq_handler().
Changing handling of SIGUSR1 to SIGUSR2 in BSP. Also SIGUSR2 will be sent from irq_debug.c rather SIGUSR1.