rtlwifi_new: Initialize some variables

In a number of places, kmalloc or valloc were used to acquire memory.
To ensure that these locations are correctly initialized, the calls were
changed to kzalloc and vzalloc. The change seems to have cleared a problem
that was causing HT operations to be cancelled.

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>

Conflicts:
	rtl8723ae/hal_btc.c