staging: wlan-ng: DIDmib_dot11mac_dot11OperationTable_dot11RTSThreshold in p80211metadef.h

Rename DIDmib_dot11mac_dot11OperationTable_dot11RTSThreshold in
p80211metadef.h to DIDMIB_DOT11MAC_OPERATIONTABLE_RTSTHRESHOLD to fix
"Avoid CamelCase" message from checkpatch and conform to the coding
style guidelines. Also shorten name by removing repeated use of
"DOT11" to ease readability and reduce long lines.

Signed-off-by: Tim Collier <osdevtc@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>