net: davicom: Use platform_get_irq_optional()

stable inclusion
from stable-5.10.27
commit 697082b125b07c57faffd70b12a42891d0803dd1
bugzilla: 51493

--------------------------------

[ Upstream commit 2e269622 ]

The second IRQ line really is optional, so use
platform_get_irq_optional() to obtain it.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Chen Jun <chenjun102@huawei.com>
Acked-by:   Weilong Chen <chenweilong@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>