net: hns3: clean up some coding style issue

driver inclusion
category: bugfix
bugzilla: NA
CVE: NA

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An enum type parameter is passed to hclge_set_fd_key_config(),
so "stage" should be declared as "enum".

Parameter of "tuple_size" is from "key_length", which with type of
"u8", so modify "tuple_size" to "u8" would be modre better

This patch also cleanup some unnecessary blank lines, redundant
parentheses.

Signed-off-by: Guojia Liao <liaoguojia@huawei.com>
Signed-off-by: shenhao <shenhao21@huawei.com>
Reviewed-by: Zhong Zhaohui <zhongzhaohui@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>