staging: wilc1000: remove function pointer wlan_add_mgmt_to_tx_que

This patch removes function pointer wlan_add_mgmt_to_tx_que and just call
the function wilc_wlan_txq_add_mgmt_pkt.
Remove structure wilc_wlan_oup_t also because no members in it. Since
wilc_wlan_oup_t is deleted, it's variable, function parameters and related
codes are also deleted.
- deleted variables
gpstrWlanOps
oup
- modified functions
wilc1000_prepare_11b_core
wilc_wlan_init

Signed-off-by: Glen Lee <glen.lee@atmel.com>
Signed-off-by: Tony Cho <tony.cho@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>