hinic3: Use array_size instead of multiplying

hinic3: Use array_size instead of multiplying

Since commit 17fcb3dc12bb ("hinic3: module initialization and tx/rx logic")
use "size * sizeof(u64)" in hinic3_feature_nego.
Use array_size instead of multiplying can make it clearer.

Link: https://lore.kernel.org/netdev/20250911123120.GG30363@horms.kernel.org/
Co-developed-by: Zhu Yikai <zhuyikai1@h-partners.com>
Signed-off-by: Zhu Yikai <zhuyikai1@h-partners.com>
Signed-off-by: Fan Gong <gongfan1@huawei.com>
Reviewed-by: Joe Damato <joe@dama.to>
Link: https://patch.msgid.link/b7d6d384ccc0bd4c0d3e7af1f90901d589cbd0b1.1769656467.git.zhuyikai1@h-partners.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>