This commit fixes build issue when multi level interrupts is enabled,
define TEST_IRQ_NUM as (CONFIG_2ND_LVL_ISR_TBL_OFFSET - 1)
- CMSIS/Core/Include/core_cm33.h:2438:15: error: array subscript 24
is above array bounds of volatile uint32_t[16]
Signed-off-by: Biwen Li <biwen.li@nxp.com>