net/ice/base: fix tunnel filtering rule

net/ice/base: fix tunnel filtering rule

If we download a NVGRE rule like "eth / ipv4 / nvgre / eth / ipv4 src
is 192.168.1.2 dst is 192.168.1.3 / end actions queue index 3 / end"
the special word will not be added because of rm->n_grp_count = 1,
so we have to change the ice_add_special_words() function before
ice_create_recipe_group(), then the special words will be add
into rm->rg_list.
Btw, the flag match_tun_mask is useless now and no need to add special
words in function ice_add_sw_recipe().

Fixes: eda40e22b858 ("net/ice/base: improve switch chained recipe")
Cc: stable@dpdk.org
Signed-off-by: Wei Zhao <wei.zhao1@intel.com>
Acked-by: Qi Zhang <qi.z.zhang@intel.com>