staging: rtl8712: Use constants from <linux/ieee80211.h>

staging: rtl8712: Use constants from <linux/ieee80211.h>

Some constants defined in wifi.h are already defined in <linux/ieee80211.h>
with some other (but similar) names.
Be consistent and use the ones from <linux/ieee80211.h>.

The conversions made are:
_SSID_IE_                -->  WLAN_EID_SSID
_SUPPORTEDRATES_IE_      -->  WLAN_EID_SUPP_RATES
_DSSET_IE_               -->  WLAN_EID_DS_PARAMS
_IBSS_PARA_IE_           -->  WLAN_EID_IBSS_PARAMS
_ERPINFO_IE_             -->  WLAN_EID_ERP_INFO
_EXT_SUPPORTEDRATES_IE_  -->  WLAN_EID_EXT_SUPP_RATES

_HT_CAPABILITY_IE_       -->  WLAN_EID_HT_CAPABILITY
_HT_EXTRA_INFO_IE_       -->  WLAN_EID_HT_OPERATION    (not used)
_HT_ADD_INFO_IE_         -->  WLAN_EID_HT_OPERATION

_VENDOR_SPECIFIC_IE_     -->  WLAN_EID_VENDOR_SPECIFIC

_RESERVED47_             --> (not used)

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/fe35fb45323adc3a30f31b7280cec7700fd325d8.1617741313.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>