staging: rtl8723au: Get rid of rtl8723au_set_hal_ops() and get rid of hal_ops.h

Since rtl8723au_set_hal_ops() is just a kmalloc(), move it to
rtw_usb_if1_init() and fix the error handling to not leak memory.

This also allows us to get rid of hal_ops.h

Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>