rtlwifi: Update to new Realtek version - Part I

This patch incorporate the differences between the 06/20/2011 and
08/16/2011 Realtek releases of the rtlwifi driver.

The changes include:

1. Handling of IEEE80211_HW_CONNECTION_MONITOR.
2. Fix typo to get proper response to nullfunc frames.

Signed-off-by: Chaoming Li <chaoming_li@realsil.com.cn>
Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>