net: hibmcge: fix incorrect multicast filtering issue

The driver does not support multicast filtering,
the mask must be set to 0xFFFFFFFF. Otherwise,
incorrect filtering occurs.

This patch fixes this problem.

Fixes: 37b367d6 ("net: hibmcge: Add unicast frame filter supported in this module")
Signed-off-by: Jijie Shao <shaojijie@huawei.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20250410021327.590362-3-shaojijie@huawei.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>