tests: kernel: gen_isr_table: Add workaround for npcx7m6fb soc.

In NPCX7M6FB, it uses some the IRQs at the end of the vector table,
for example, the irq 60 and 61 used for Multi-Input Wake-Up Unit (MIWU)
device by default, and conflicts with isr used for testing. Moving IRQs
for this test suite to solve the issue.

Signed-off-by: Mulin Chao <MLChao@nuvoton.com>