staging: rtl8723au: Fold some resource allocation abstraction into their callers

Fold rtw_os_recvbuf_resource_alloc23a() and
rtw_os_recvbuf_resource_free23a() into the functions calling them.

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