drivers: timer: ti_dmtimer: provide timer IRQ for tests

This patch allows ti_dmtimer to provide the symbol z_sys_timer_irq_for_test
whenever tests are enabled. Not providing this results in failing some
kernel test cases which require this symbol.

Signed-off-by: Amneesh Singh <a-singh7@ti.com>

Author: natto1784

drivers/timer/ti_dmtimer.c

@@ -21,6 +21,10 @@
 #define TIMER_IRQ_PRIO  DT_INST_IRQ(0, priority)
 #define TIMER_IRQ_FLAGS DT_INST_IRQ(0, flags)
 
+#if defined(CONFIG_TEST)
+const int32_t z_sys_timer_irq_for_test = TIMER_IRQ_NUM;
+#endif
+
 #define CYC_PER_TICK ((uint32_t)(sys_clock_hw_cycles_per_sec() / CONFIG_SYS_CLOCK_TICKS_PER_SEC))
 
 #define MAX_TICKS ((k_ticks_t)(UINT32_MAX / CYC_PER_TICK) - 1)